57+9= 78-30= 73-13= 60+25=
70-20+8= 45+18-9= 50-(7+24)= 42-10-3=
64-29+35= 47+28-19=
92- (36+29)= 63-45+17=
□○□○□=□(只)
32-9= 52+8= 86-5= 16+8=
3×5= 75-22= 52+30= 63-(40+20)=
36+30= 49-29= 61-4= 50+50= 25-5+40=
5+48= 54-11= 98-80= 100-70= 73-(4+5)=
13+7+40= 56-20-16= 60+5-40=
22+18+24= 78-28+15= 52-6+30=