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7.8÷x=0.2?

表示7.8中有几个0.2 或者7.8是0.2的多少倍

8x÷0.2=x+7.8 40x=x+7.8 39x=7.8 x=0.2

=9.8÷0.7÷0.2 =14÷0.2 =70

x÷0.8-2=7.5 解:x÷0.8=9.5 x=9.5*0.8 x=7.6

括号里100-x括住乘以0.8-0.2=7.8 解:0.8(100-x)=7.8+0.2 0.8×(100-x)=8 100-x=8÷0.8 100-x=10 x=100-10 x=90

7.8x(199.8+0.2) =7.8x200 =1560

7.2÷1.6+0.8 =(7.2÷8)÷(1.6÷8)+0.8 =0.9÷0.2+0.8 =4.5+0.8 =5.3

7.8x0.2 +78x0.98 =7.8*0.2+7.8*(10*0.98) =7.8*(0.2+9.8) =7.8*10 =78

1.7-1.7x0.2÷6.8 =(1.7x6.8-1.7x0.2)÷6.8 =1.7x6.6÷6.8 =1.7x6.6÷(1.7x4) =1.65

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