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