用时______分______秒
|
10-3= |
26+3= |
21-13= |
16-7= |
|
38-12= |
22-12= |
11+22= |
17-5= |
|
11+11= |
44-11= |
35-23= |
35-26= |
|
34-17= |
24-14= |
8-2= |
1+46= |
|
34-2= |
34-31= |
9+27= |
6+25= |
|
28-27= |
7-3= |
35-10= |
8+12= |
|
23+20= |
33+1= |
43+2= |
36+8= |
|
27-14= |
10+26= |
8+31= |
21+2= |
|
29-1= |
8-4= |
28-18= |
32-12= |
|
3+5= |
24+10= |
36-25= |
23+9= |
|
13+2= |
32-13= |
16-15= |
35-17= |
|
22-21= |
34+2= |
43-4= |
30-8= |
|
44-24= |
27-18= |
38-36= |
50-27= |
|
12+12= |
7-7= |
16-2= |
13-6= |
|
50-34= |
24-11= |
5-5= |
16+4= |
|
35+6= |
36-19= |
7+36= |
19-8= |
|
5+31= |
26+11= |
44-20= |
24-11= |
|
33-16= |
25-7= |
43-5= |
34-6= |
|
49-38= |
17-16= |
19-17= |
48-21= |
用时______分______秒
|
7+3= |
31-8= |
25-23= |
25-2= |
|
45-30= |
7+25= |
33-14= |
19-2= |
|
6+43= |
39-38= |
6+14= |
29-7= |
|
50-38= |
32+13= |
40+5= |
14+9= |
|
22+20= |
40-5= |
42-8= |
4+45= |
|
34-26= |
34-22= |
42-7= |
23-11= |
|
35-16= |
17-13= |
48-29= |
16-8= |
|
18-6= |
43-31= |
4+45= |
25+11= |
|
23-1= |
23+15= |
34-9= |
46+1= |
|
50-39= |
11+12= |
23-13= |
37+11= |
|
49-1= |
28-2= |
22+26= |
13+37= |
|
14+29= |
15+26= |
4+44= |
30+14= |
|
29-28= |
16+10= |
28+10= |
16-1= |
|
21-15= |
19+23= |
40-28= |
8+8= |
|
21-21= |
30-24= |
33-11= |
33-29= |
|
43-6= |
33-4= |
27-13= |
31-31= |
|
21-2= |
31+13= |
35-17= |
7+34= |
|
16-11= |
47-37= |
43+4= |
21+12= |
|
50-26= |
26+5= |
6+19= |
32+16= |
爱口算ikousuan.cn，第1页共10页。
用时______分______秒
|
27+7= |
38-3= |
24-15= |
28-20= |
|
24-5= |
45-37= |
37-16= |
33+7= |
|
37-10= |
5+23= |
25+24= |
32-11= |
|
42+2= |
11+15= |
43-27= |
21-5= |
|
38-22= |
44-40= |
28+2= |
23+6= |
|
6-6= |
6+43= |
46-45= |
10+38= |
|
21+25= |
35-10= |
35-6= |
39+5= |
|
47-23= |
16-12= |
40-20= |
32-11= |
|
29+6= |
16-16= |
16+31= |
24-5= |
|
4+21= |
25+17= |
9+13= |
49-44= |
|
48-43= |
23+25= |
26+10= |
47-9= |
|
34-10= |
45-29= |
42-14= |
41-25= |
|
29+19= |
21+6= |
44-26= |
36+8= |
|
50-45= |
33-4= |
15+7= |
46-19= |
|
29-23= |
8+32= |
50-48= |
44-23= |
|
28-16= |
23-23= |
16+15= |
40-10= |
|
21-2= |
13+22= |
50-13= |
15+30= |
|
34-31= |
13-11= |
32-21= |
49-45= |
|
35-7= |
20-17= |
15+18= |
13+17= |
用时______分______秒
|
40-14= |
28+17= |
43-41= |
21+13= |
|
34+8= |
30-14= |
29-27= |
5+32= |
|
20-17= |
36-5= |
33+1= |
2+21= |
|
25+16= |
23+16= |
45-41= |
44-44= |
|
30+9= |
24+7= |
6+30= |
32-27= |
|
20+9= |
34-25= |
20-18= |
44-20= |
|
1+4= |
1+4= |
12+28= |
14+14= |
|
28-22= |
50-49= |
4+3= |
38-15= |
|
21-6= |
28-28= |
36+7= |
13+24= |
|
18-3= |
14+2= |
5+36= |
24-3= |
|
11-1= |
24-6= |
47-24= |
47-28= |
|
3+27= |
4+30= |
50-28= |
16+1= |
|
13+31= |
5+45= |
12-7= |
5+30= |
|
6+34= |
41-17= |
11-8= |
21-6= |
|
42-12= |
1+40= |
40+8= |
2+4= |
|
19+18= |
50-43= |
21+1= |
37+1= |
|
8+30= |
47-31= |
46-25= |
30+1= |
|
15-15= |
22-9= |
48-45= |
10+34= |
|
40-9= |
6+44= |
16+30= |
8+8= |
爱口算ikousuan.cn，第2页共10页。
用时______分______秒
|
37-10= |
30+16= |
31-19= |
41-26= |
|
35-19= |
25+19= |
1+36= |
9+25= |
|
5+23= |
5+28= |
43-12= |
42-32= |
|
46-7= |
18+11= |
17-14= |
29-1= |
|
30-16= |
45-25= |
3+19= |
49-43= |
|
42-12= |
34-5= |
8+33= |
27-13= |
|
11+2= |
50-42= |
43-20= |
5+43= |
|
16+21= |
46-45= |
28+19= |
42-32= |
|
16+18= |
50-45= |
6+23= |
1+37= |
|
21-4= |
29-27= |
28-3= |
14+17= |
|
35-1= |
29+18= |
11+13= |
8+26= |
|
24+25= |
42-32= |
17-6= |
11+23= |
|
44-12= |
50-41= |
30-6= |
49-3= |
|
14-3= |
47-2= |
15-9= |
30-8= |
|
1+9= |
50-4= |
33+10= |
50-50= |
|
16+6= |
44-18= |
41-36= |
32-16= |
|
41-36= |
45-38= |
44-6= |
14+10= |
|
9+39= |
36-13= |
1+18= |
38-35= |
|
48-27= |
19-15= |
41-20= |
11-4= |
用时______分______秒
|
45-17= |
20+25= |
48+1= |
26-11= |
|
25-9= |
40-7= |
49-25= |
42-33= |
|
33-9= |
31-16= |
50-42= |
6+6= |
|
37-4= |
50-9= |
4+13= |
46-2= |
|
21+23= |
11+21= |
6+22= |
46-25= |
|
43-7= |
41+2= |
31-6= |
3+34= |
|
20-8= |
36-18= |
16+2= |
21-21= |
|
16-2= |
43-20= |
31-16= |
27+8= |
|
41-36= |
46-4= |
32-6= |
35-23= |
|
2+41= |
15+33= |
20+16= |
21+23= |
|
23+21= |
3-3= |
50-22= |
3+41= |
|
34-34= |
3+15= |
44-13= |
12+33= |
|
23+23= |
20+17= |
14-5= |
28-10= |
|
48-28= |
28-3= |
10+30= |
18+29= |
|
43-11= |
31-9= |
23+14= |
35+11= |
|
24+23= |
35-32= |
4+22= |
50-44= |
|
12+24= |
14-13= |
49-7= |
19-5= |
|
15-7= |
19+8= |
49-9= |
11+25= |
|
24-2= |
42-35= |
50-19= |
16+11= |
爱口算ikousuan.cn，第3页共10页。
用时______分______秒
|
2+25= |
40-32= |
36-31= |
19+9= |
|
1+12= |
17+32= |
1+18= |
49-26= |
|
15+28= |
32-19= |
40-37= |
17+12= |
|
32-14= |
25-5= |
47-33= |
10+3= |
|
5+14= |
6+9= |
7+31= |
13+37= |
|
20+11= |
42-8= |
35-24= |
20-14= |
|
24+5= |
19+28= |
32-28= |
22+15= |
|
15+21= |
11+16= |
10-4= |
34-22= |
|
13+33= |
43-38= |
34-17= |
29-5= |
|
17+27= |
16+19= |
37-5= |
5+43= |
|
38-17= |
44-12= |
14-5= |
28-20= |
|
48-15= |
19+15= |
40-31= |
31+18= |
|
1+28= |
39-4= |
39+2= |
29+10= |
|
19-8= |
39+10= |
14+6= |
35-3= |
|
9+7= |
23+2= |
28+6= |
16-13= |
|
45-21= |
48-47= |
37+12= |
6+33= |
|
49-36= |
14-5= |
25+2= |
45-42= |
|
9+35= |
25+9= |
12+24= |
31-14= |
|
15+34= |
24-5= |
42-13= |
39-27= |
用时______分______秒
|
5+1= |
41-14= |
37+2= |
44+6= |
|
39-11= |
48-28= |
8+33= |
4+11= |
|
32+2= |
43-36= |
20+2= |
12+3= |
|
43+6= |
47-46= |
48-1= |
22+26= |
|
33-5= |
30+12= |
5+13= |
12+27= |
|
32-6= |
50-19= |
45-11= |
23-6= |
|
43-20= |
40-31= |
16+18= |
33+3= |
|
16-15= |
47-27= |
48-13= |
16+29= |
|
46-35= |
12+17= |
47-30= |
15+8= |
|
32+14= |
29-10= |
39-39= |
24+23= |
|
8+6= |
48-30= |
10+33= |
1+7= |
|
15+28= |
34+3= |
5+35= |
43-17= |
|
10+15= |
39-16= |
5+19= |
17+12= |
|
37+1= |
7+34= |
18+12= |
18+28= |
|
8+4= |
18+7= |
13-2= |
30+12= |
|
50-28= |
19+22= |
14+3= |
9-5= |
|
26+23= |
44-18= |
25+15= |
27-24= |
|
30+17= |
4+18= |
40-13= |
48-24= |
|
24+22= |
48-48= |
36-20= |
24-8= |
爱口算ikousuan.cn，第4页共10页。
用时______分______秒
|
6+13= |
18+26= |
6+43= |
2+36= |
|
28+1= |
44-43= |
40-38= |
41-1= |
|
5+24= |
23+6= |
12+38= |
20-19= |
|
15-4= |
22+5= |
43-22= |
4+16= |
|
43+7= |
6+30= |
37-17= |
41-19= |
|
35-22= |
27+19= |
40-34= |
22-11= |
|
40+5= |
10+40= |
20+8= |
8+2= |
|
2+36= |
2+20= |
49-41= |
27-24= |
|
46-28= |
18+9= |
11+24= |
38-21= |
|
3+45= |
40-18= |
30-27= |
28+7= |
|
23+5= |
27-23= |
11+2= |
11+2= |
|
46+1= |
50-48= |
48-25= |
48-32= |
|
13-8= |
30+13= |
41-21= |
26+21= |
|
7+5= |
39+11= |
10+31= |
15+32= |
|
35-8= |
2+41= |
17-2= |
14-12= |
|
37-19= |
11+9= |
20+22= |
40+1= |
|
35-27= |
42-35= |
24+1= |
13-10= |
|
45-26= |
47-34= |
32-19= |
21+9= |
|
12+7= |
16+5= |
1+46= |
47-23= |
用时______分______秒
|
17+12= |
12+31= |
17-6= |
9+3= |
|
30-20= |
16+6= |
32-19= |
7+34= |
|
12-8= |
20-17= |
5+22= |
9+9= |
|
6+14= |
3+29= |
27-27= |
44-18= |
|
15-7= |
45-14= |
7+20= |
47-39= |
|
45-23= |
31+7= |
2+40= |
34-1= |
|
11+15= |
17-11= |
19+8= |
21+5= |
|
8+29= |
18+2= |
48-11= |
46-15= |
|
49-17= |
33+5= |
22-15= |
31+1= |
|
27-3= |
42-21= |
34-12= |
28-4= |
|
33-29= |
14-3= |
32+11= |
19-2= |
|
36+6= |
5-2= |
26-3= |
26-12= |
|
38-14= |
16-9= |
22-16= |
14-10= |
|
4+40= |
41-30= |
23-10= |
27+14= |
|
49-17= |
50-46= |
35-7= |
47-13= |
|
47-30= |
31-24= |
15+34= |
37-33= |
|
4+21= |
38-20= |
17+30= |
5+7= |
|
30-11= |
9+39= |
2+18= |
27-3= |
|
11+17= |
26-22= |
28+17= |
11+6= |
爱口算ikousuan.cn，第5页共10页。
用时______分______秒
|
25-12= |
15-10= |
21+11= |
16+26= |
|
21+6= |
16-9= |
23+10= |
18+20= |
|
15+31= |
24+23= |
18+4= |
25-13= |
|
17-7= |
25-19= |
33+13= |
10+40= |
|
36+9= |
29-23= |
2+35= |
45-18= |
|
17+10= |
15-10= |
18+21= |
17-10= |
|
25-19= |
49-3= |
42-30= |
1+17= |
|
6+25= |
21-14= |
38-30= |
28-10= |
|
10+8= |
22+3= |
48-20= |
45-9= |
|
12+19= |
18-15= |
20-18= |
21-2= |
|
40-5= |
49-22= |
5+44= |
35-23= |
|
18+1= |
46-20= |
6-6= |
9+17= |
|
40-18= |
15+17= |
27-25= |
6+11= |
|
1+16= |
18+14= |
48+2= |
11+13= |
|
12-3= |
46-41= |
45-9= |
17+28= |
|
41-30= |
38-5= |
26+18= |
39-39= |
|
9+39= |
29+11= |
40-15= |
43-17= |
|
19-1= |
18+20= |
10+1= |
5+10= |
|
33-6= |
49-17= |
1+2= |
46-44= |
用时______分______秒
|
19+8= |
25+7= |
24+6= |
15-7= |
|
37+9= |
12+9= |
14+20= |
38+10= |
|
8+32= |
6+5= |
25+23= |
24+15= |
|
8+27= |
32+12= |
22-21= |
41+8= |
|
32-4= |
33-20= |
44-18= |
46-7= |
|
25+22= |
42-36= |
15+24= |
8-7= |
|
50-14= |
3+9= |
12+18= |
49-18= |
|
7-7= |
41-20= |
15+12= |
41-35= |
|
28-7= |
14+14= |
17-7= |
32-10= |
|
30-4= |
21+8= |
20-17= |
48-35= |
|
18-16= |
26-21= |
48-26= |
22-3= |
|
48-35= |
9+36= |
46-20= |
4+44= |
|
6+10= |
34-13= |
26+9= |
7-2= |
|
41-18= |
20-11= |
47-23= |
9-9= |
|
29-14= |
23-8= |
28-10= |
1+37= |
|
27+14= |
17+21= |
23+7= |
49-25= |
|
4-1= |
23+18= |
15+23= |
9+37= |
|
31-5= |
4+7= |
2+35= |
11+20= |
|
26+7= |
28-10= |
38-35= |
46-31= |
爱口算ikousuan.cn，第6页共10页。
用时______分______秒
|
47-44= |
11+19= |
38-1= |
47-22= |
|
23+6= |
10+21= |
46-32= |
18+26= |
|
44-23= |
41-27= |
25-19= |
31-10= |
|
5+11= |
24-20= |
19+20= |
44-18= |
|
18+17= |
21+6= |
40-2= |
33-9= |
|
37-18= |
19-17= |
27-5= |
35-10= |
|
8+31= |
49-6= |
42+1= |
25-6= |
|
50-44= |
25-5= |
5+31= |
10+13= |
|
6+16= |
33-14= |
40-19= |
31+14= |
|
3+39= |
7+22= |
7-5= |
35-12= |
|
36-13= |
1+18= |
3+32= |
25-14= |
|
30-3= |
46-21= |
24-3= |
46-39= |
|
41-30= |
32-19= |
4+8= |
15-11= |
|
13+20= |
26+21= |
50-8= |
11-5= |
|
26-20= |
48-34= |
23+27= |
11+6= |
|
7+23= |
47-39= |
22+10= |
13-12= |
|
15+7= |
16+29= |
47-37= |
23-22= |
|
7+21= |
40+4= |
8-3= |
2+45= |
|
50-5= |
20-4= |
35-2= |
31-26= |
用时______分______秒
|
50-5= |
44-37= |
42-29= |
22+12= |
|
21-3= |
28+10= |
5+33= |
48-21= |
|
29+5= |
28+3= |
29-4= |
32+15= |
|
31-29= |
13+8= |
23+12= |
32-6= |
|
10+33= |
27+1= |
26+16= |
36+13= |
|
49-34= |
24+20= |
42+2= |
16+23= |
|
37-34= |
21+4= |
34-28= |
7-5= |
|
33-16= |
24+10= |
19-6= |
45-27= |
|
17+27= |
8+30= |
39+10= |
50-22= |
|
29-15= |
32-12= |
37+4= |
46-17= |
|
50-45= |
12+27= |
39-7= |
30-20= |
|
43-19= |
2+20= |
29+8= |
33-7= |
|
39-36= |
49-1= |
16-12= |
21+3= |
|
17+30= |
42-13= |
38-12= |
11+38= |
|
50-21= |
8-7= |
30-3= |
14-10= |
|
30-19= |
1+4= |
17+19= |
23-8= |
|
24+7= |
31-13= |
20+24= |
35-26= |
|
45+3= |
34-18= |
34+7= |
39-36= |
|
16-15= |
1+33= |
10+10= |
20+30= |
爱口算ikousuan.cn，第7页共10页。
用时______分______秒
|
44-5= |
6-6= |
17+26= |
48-16= |
|
42-7= |
35-14= |
24-1= |
42-30= |
|
15+2= |
12+32= |
4+31= |
40+3= |
|
32-3= |
13+24= |
40-35= |
9+4= |
|
6+18= |
22-12= |
26+10= |
21+11= |
|
46-25= |
45-21= |
39+10= |
12-1= |
|
3+38= |
12+37= |
14-12= |
41-37= |
|
43-5= |
45-25= |
36-25= |
31+8= |
|
16-7= |
45-30= |
45-7= |
25+14= |
|
43-31= |
3+31= |
34+4= |
47-26= |
|
50-10= |
39-29= |
24+20= |
47-30= |
|
8-6= |
7-3= |
35-27= |
33-11= |
|
18-7= |
48-25= |
8+13= |
22+12= |
|
37+12= |
47-10= |
18+10= |
1+1= |
|
30-19= |
48-22= |
50-38= |
31-20= |
|
11+4= |
18+15= |
49-46= |
19-3= |
|
27-21= |
50-30= |
14-4= |
17+15= |
|
13-13= |
41-33= |
31+3= |
23+25= |
|
46-5= |
6+38= |
34+15= |
34-23= |
用时______分______秒
|
37+6= |
50-12= |
43-35= |
39-8= |
|
26-3= |
39-24= |
2+46= |
17+12= |
|
50-46= |
24-21= |
11+21= |
35+5= |
|
6+38= |
6+40= |
10-6= |
33-5= |
|
30-7= |
30-17= |
36-22= |
6+41= |
|
37-7= |
26+4= |
27-12= |
1+10= |
|
50-27= |
49-20= |
24-23= |
12+25= |
|
40-31= |
13+21= |
36-18= |
48-18= |
|
21-1= |
25-20= |
46-28= |
9+34= |
|
16-16= |
40+7= |
42-35= |
37-27= |
|
31-29= |
38-10= |
50-33= |
17+22= |
|
31-4= |
47-26= |
43-21= |
31-15= |
|
18+24= |
43+5= |
15+28= |
24-3= |
|
42-13= |
50-8= |
46-4= |
21-13= |
|
45-43= |
44-15= |
49-8= |
10+35= |
|
31-16= |
9+36= |
12+24= |
35+3= |
|
50-43= |
16+33= |
12+30= |
8+4= |
|
12+38= |
39+8= |
26+20= |
3+22= |
|
20-6= |
19+23= |
49-42= |
4+23= |
爱口算ikousuan.cn，第8页共10页。
用时______分______秒
|
4+14= |
4+20= |
27-18= |
13-2= |
|
29-2= |
6+12= |
8+31= |
23+3= |
|
47+3= |
45-37= |
34+6= |
39-9= |
|
46+2= |
35-13= |
22+19= |
5+19= |
|
39-12= |
50-13= |
3+17= |
24-5= |
|
5+40= |
47-25= |
42-42= |
29-9= |
|
1+5= |
24-3= |
13+2= |
48-16= |
|
28+11= |
26-16= |
3+4= |
31-25= |
|
38+1= |
48-1= |
14+2= |
45-26= |
|
29-9= |
32-13= |
13+31= |
48-35= |
|
7+30= |
3+42= |
21+19= |
48+2= |
|
29-19= |
36-23= |
31+18= |
32-32= |
|
32-6= |
50-40= |
1+34= |
42-33= |
|
50-23= |
40+8= |
39-36= |
33-30= |
|
10-2= |
39-24= |
50-25= |
2+19= |
|
3+32= |
35-20= |
3+11= |
46-29= |
|
42-32= |
28+17= |
33-14= |
4+28= |
|
11+9= |
21-2= |
36-15= |
30-1= |
|
21-6= |
21+12= |
11-4= |
4+42= |
用时______分______秒
|
33-17= |
39-12= |
26-1= |
38+6= |
|
16+21= |
40-6= |
42-24= |
50-44= |
|
45-25= |
18+6= |
40-6= |
40-6= |
|
41-14= |
48-17= |
7+15= |
9-6= |
|
44-16= |
14+15= |
28-19= |
29+6= |
|
37-14= |
23-5= |
17-3= |
11+30= |
|
1+4= |
18+18= |
36-30= |
15+8= |
|
11+14= |
23+26= |
42-9= |
41-41= |
|
12+8= |
36-25= |
35-7= |
36-3= |
|
3+17= |
41-6= |
50-11= |
16+5= |
|
16+16= |
41-21= |
5+6= |
6+6= |
|
47-46= |
38-35= |
41-38= |
16+13= |
|
17+22= |
31-11= |
1+27= |
6+1= |
|
17+6= |
16+15= |
26-6= |
42-5= |
|
32+3= |
36-31= |
26+7= |
37-9= |
|
15+9= |
45-42= |
13+31= |
39-20= |
|
49-13= |
43-31= |
22-5= |
28-4= |
|
32-28= |
16+8= |
18-10= |
15-8= |
|
12+11= |
20+10= |
22-8= |
27-5= |
爱口算ikousuan.cn，第9页共10页。
用时______分______秒
|
42-35= |
47-4= |
2+13= |
2+29= |
|
50-8= |
15-15= |
27-23= |
19+30= |
|
1+39= |
49-14= |
17+4= |
49-2= |
|
25-22= |
1+23= |
49-14= |
50-15= |
|
16+32= |
5-4= |
42-28= |
18+15= |
|
39-24= |
31+16= |
5+37= |
44-18= |
|
50-49= |
29+7= |
37+2= |
19+28= |
|
31-29= |
48-35= |
6+16= |
19+8= |
|
32+7= |
26+21= |
37-27= |
8+14= |
|
42-26= |
15-7= |
6+21= |
10+31= |
|
21-2= |
37+7= |
40+8= |
32-28= |
|
19+27= |
49-6= |
45-24= |
41-1= |
|
35-17= |
42-25= |
15+14= |
2+11= |
|
26-3= |
1+14= |
14-13= |
25+6= |
|
14-4= |
16+13= |
25-18= |
37-28= |
|
50-15= |
28-14= |
11-7= |
44-7= |
|
27-1= |
25+9= |
22+14= |
26-16= |
|
11+23= |
47-17= |
4-3= |
38-21= |
|
9+35= |
24+21= |
32+4= |
40-40= |
用时______分______秒
|
13+34= |
41-40= |
14-4= |
9+13= |
|
25-12= |
30+20= |
47-9= |
9+13= |
|
47-32= |
16+28= |
50-46= |
25-19= |
|
19+9= |
23-19= |
22-5= |
40-26= |
|
17+30= |
22-10= |
44-25= |
41-39= |
|
30+10= |
21-20= |
17+8= |
16+33= |
|
28+16= |
16-9= |
5-1= |
7+38= |
|
41-21= |
23-19= |
41+6= |
46-24= |
|
46-22= |
50-34= |
19-15= |
47-42= |
|
23-17= |
8+27= |
4+33= |
29-15= |
|
44-41= |
16+21= |
25-20= |
19-2= |
|
8+31= |
14+6= |
25+13= |
28+12= |
|
33-1= |
18+26= |
11-7= |
46-46= |
|
20-17= |
22+10= |
3-1= |
49-43= |
|
9+6= |
35-35= |
42+6= |
7+26= |
|
18+10= |
20+15= |
37-31= |
25+18= |
|
38+6= |
50-30= |
3+25= |
36+10= |
|
18-7= |
24-17= |
6+25= |
50-39= |
|
40-13= |
8+17= |
42-25= |
3-2= |
爱口算ikousuan.cn，第10页共10页。
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