问题 解答题
解方程.
x:0.75=
5
6
x+
x
5
=240
3x-120%x=45.
答案

(1)x:0.75=

5
6

x÷0.75=

5
6

x÷0.75×0.75=

5
6
×0.75,

x=0.625;

(2)x+

x
5
=240,

6
5
x=240,

6
5
6
5
=240÷
6
5

x=200;

(3)3x-120%x=45,

1.8x=45,

1.8x÷1.8=45÷1.8,

x=25.

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