问题 解答题

解方程.

x+10.5=79.7

5x=0.25

7÷x=0.5

x÷1.1=3.

答案

(1)x+10.5=79.7,

x+10.5-10.5=79.7-10.5,

x=69.2;

(2)5x=0.25,

5x÷5=0.25÷5,

x=0.05;

(3)7÷x=0.5,

7÷x×x=0.5×x,

0.5x=7,

0.5x÷0.5=7÷0.5,

x=14;

(4)x÷1.1=3,

x÷1.1×1.1=3×1.1,

x=3.3.

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