问题 解答题
解下列方程.
(1)x+2.4=5.6
(2)x-30=60(3)2.5x=8(4)3x=54(5)x÷0.3=4.2.
答案

(1)x+2.4=5.6,

x+2.4-2.4=5.6-2.4,

x=3.2;

(2)x-30=60,

x-30+30=60+30,

x=90;

(3)2.5x=8,

2.5x÷2.5=8÷2.5,

x=3.2;

(4)3x=54,

3x÷3=54÷3,

x=18;

(5)x÷0.3=4.2,

x÷0.3×0.3=4.2×0.3,

x=1.26.

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