“退位”只針對(duì)減法,你所需要的就是20以內(nèi)不退位減法的題庫.
計(jì)算一下,一共145道題而已,我給你列出來吧：
1-1=
2-1=
2-2=
3-1=
3-2=
3-3=
4-1=
4-2=
4-3=
4-4=
5-1=
5-2=
5-3=
5-4=
5-5=
6-1=
6-2=
6-3=
6-4=
6-5=
6-6=
7-1=
7-2=
7-3=
7-4=
7-5=
7-6=
7-7=
8-1=
8-2=
8-3=
8-4=
8-5=
8-6=
8-7=
8-8=
9-1=
9-2=
9-3=
9-4=
9-5=
9-6=
9-7=
9-8=
9-9=
10-10=
11-1=
11-10=
11-11=
12-1=
12-2=
12-10=
12-11=
12-12=
13-1=
13-2=
13-3=
13-10=
13-11=
13-12=
13-13=
14-1=
14-2=
14-3=
14-4=
14-10=
14-11=
14-12=
14-13=
14-14=
15-1=
15-2=
15-3=
15-4=
15-5=
15-10=
15-11=
15-12=
15-13=
15-14=
15-15=
16-1=
16-2=
16-3=
16-4=
16-5=
16-6=
16-10=
16-11=
16-12=
16-13=
16-14=
16-15=
16-16=
17-1=
17-2=
17-3=
17-4=
17-5=
17-6=
17-7=
17-10=
17-11=
17-12=
17-13=
17-14=
17-15=
17-16=
17-17=
18-1=
18-2=
18-3=
18-4=
18-5=
18-6=
18-7=
18-8=
18-10=
18-11=
18-12=
18-13=
18-14=
18-15=
18-16=
18-17=
18-18=
19-1=
19-2=
19-3=
19-4=
19-5=
19-6=
19-7=
19-8=
19-9=
19-10=
19-11=
19-12=
19-13=
19-14=
19-15=
19-16=
19-17=
19-18=
19-19=