共30题 用时5分钟
53-35=
44-44=
32-23=
37-21=
43-26=
40-28=
65-47=
46-17=
81-13=
77-19=
65-32=
74-47=
72-67=
55-28=
65-19=
13+60=
36-17=
30-18=
70+1=
54-4=
71-28=
41-27=
5+40=
62-57=
92-68=
70-21=
60-22=
44-19=
66-38=
88-9=