问题 解答题

解下列方程

(1)1.3÷x=0.52

(2)10.2-5x=2.2

(3)3×1.5+6x=33

(4)5.6x-3.8=1.8.

答案

(1)1.3÷x=0.52,

1.3÷x×x=0.52×x,

1.3=0.52x,

0.52x=1.3,

0.52x÷0.52=1.3÷0.52,

x=2.5;

(2)10.2-5x=2.2,

10.2-5x+5x=2.2+5x,

10.2=2.2+5x,

2.2+5x=10.2,

2.2+5x-2.2=10.2-2.2,

5x=8,

5x÷5=8÷5,

x=

8
5

(3)3×1.5+6x=33,

4.5+6x=33,

4.5+6x-4.5=33-4.5,

6x=28.5,

6x÷6=28.5÷6,

x=4.75;

(4)5.6x-3.8=1.8,

5.6x-3.8+3.8=1.8+3.8,

5.6x=5.6,

5.6x÷5.6=5.6÷5.6,

x=1.

名词解释

T2

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