问题 解答题

解方程.

x+3.8=10

x-18.6=21.8

x÷6=0.7

5.4x=2.7.

答案

(1)x+3.8=10,

x+3.8-3.8=10-3.8,

x=6.2;

(2)x-18.6=21.8,

x-18.6+18.6=21.8+18.6,

x=40.4;

(3)x÷6=0.7,

x÷6×6=0.7×6,

x=4.2;

(4)5.4x=2.7,

5.4x÷5.4=2.7÷5.4,

x=0.5.

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