姓名: 年级:
10+(25+5)= 35 +(15-9)= 20+(30-8)=
50-(2+5)= 64-(13+7)= 38+(27-20)=
9+(30+17)= 17+(60-30)= 28+(28-8)=
39+(70-60)= 80-(37-7)= 1+(45+5)=
12+(49-9)= 40+(6+7)= 24+(33-3)=
65-(20-10)= 60-(13-9)= 66+(2+7)=
49+(19-10)= 60-(10-9)= 50+(40-30)=