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A .3倍 B .6倍 C .9倍 D .27倍
1+15%= 1÷50%= 37.5%+ = 6- = 0.77+0.33= 16×2.5=
+ = ÷ = 1.25×0.8= :5= 7÷1.4= 9+ =
+25%= 1.5× = ÷2= 1÷ - ÷1=
1.25×2.4= 10-10%= ÷ =
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