( )
6×3= 81÷9= 9×2+2= 100-20-15=
7×5= 20÷4= 6×8-8= 50-30+50=
60+3= 9×7= 30+20+7= 7×8+8=
90-70= 6×5= 98-8-80= 5×6-7=
52-5= 1×8= 35-(40-5)= 9×5+5=
加法算式:
乘法算式: