问题 解答题
解下列方程.
(1)9×6+x=76.8
(2)(1-45%)x=110
(3)
6
5
÷x=
7
4
×
2
3

(4)5.6x+12.88=42.
答案

(1)9×6+x=76.8

54+x=76.8

54+x-54=76.8-54

x=22.8

(2)(1-45%)x=110

0.55x=110

0.55x÷0.55=110÷0.55

x=200

(3)

6
5
÷x=
7
4
×
2
3

6
5
÷x×x=
7
6
×x

7
6
x=
6
5

7
6
6
7
=
6
5
×
6
7

x=

36
35

(4)5.6x+12.88=42

5.6x+12.88-12.88=42-12.88

5.6x=29.12

5.6x÷5.6=29.12÷5.6

x=5.2

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