34÷5=6……4
21÷7=
9÷9=
4×7=
160-70=
700+400=
8700-7000=
64÷8=
990-90=
有个 。
-= 20÷= 0.77+0.23= +2-+2=
0.3÷0.5= ×7.2= 4000÷80= 1.5×4+6=
× = 4÷0.8= 3﹣ = 0.23=
÷ = 786﹣298= 25×0.7×4= 8.7+7=
( ﹣0.375)÷ = × ÷ × =