问题 解答题
解方程.
0.35x=7

x÷0.2=0.5

x+0.42=4.2

x-4.6=6.4.
答案

(1)0.35x=7,

0.35x÷0.35=7÷0.35,

x=20;

(2)x÷0.2=0.5,

x÷0.2×0.2=0.5×0.2,

x=0.1;

(3)x+0.42=4.2,

x+0.42-0.42=4.2-0.42,

x=3.78;

(4)x-4.6=6.4,

x-4.6+4.6=6.4+4.6,

x=11.

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