口算 0.1×9.02= 1.6×3= 1.2×0.6= 100÷200= 6.2×0.3= 0.7+7.32= 0.6×07= 2.8÷70= 0.9×0.4= 2.1÷7÷0.1=
10-=
206+ 598=
42 :="x" :
求未知数X x-x=
(2.4×1.5-1.5)÷0.7
=
="x" :
x=
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