问题 解答题
解方程.
(1)1.8:x=7.2:0.8

(2)χ+5%χ=0.42÷10%

(3)32÷χ=
5
3
÷125%
答案

(1)1.8:x=7.2:0.8,

7.2x=1.8×0.8,

7.2x÷7.2=1.44÷7.2,

x=0.2;

(2)x+5%x=0.42÷10%,

105%x=4.2,

105%x÷105%=4.2÷105%,

x=4;

(3)32÷x=

5
3
÷125%,

32÷x=

4
3

32÷x×x=

4
3
×x,

4
3
x÷
4
3
=32÷
4
3

x=24.

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