共30题 用时5分钟
57+30=
7+50=
58-3=
20+23=
50+28=
18+30=
50+38=
40+47=
52-50=
86-40=
68-5=
5+43=
58-8=
55-3=
47-7=
48+8=
52+30=
96-90=
22+50=
49+3=
30+20=
56+3=
7+42=
17+50=
25+20=
6+30=
100-30=
88-60=
7+40=
11+2=