1.2×7= 13.2×0.2= 0.001÷0.1= 18.7×0×4=
8÷5= 2.4×5= 420×0.05= 0÷2.5×4=
2.4÷x=0.4
6x-2.8=4.7
(x+7)÷2=10.3
改正:
-= 20÷= 0.77+0.23= +2-+2=
0.3÷0.5= ×7.2= 4000÷80= 1.5×4+6=