共30题 用时5分钟
35+2=
28+6=
29-7=
86-40=
73+4=
7+64=
43+5=
25+4=
87+10=
39-3=
95-40=
48-30=
50-4=
63+3=
34-20=
80-7=
89-5=
62+7=
42-2=
40+9=
63-30=
56+10=
20+67=
23-6=
20+80=
37-7=
51+8=
72-60=
90-70=
68-8=