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