问题 解答题
2
3
x=2-x
5(x-2.4)=3(4-x)
0.1
x
=
0.25
0.125
答案

(1)

2
3
X=2-X

2
3
X+X=2-X+X

5
3
X=2

X=

6
5

(2)5(X-2.4)=3(4-X)

5X-12=12-3X

5X-12+12=12-3X+12

5X+3X=24-3X+3X

8X=24

X=3;

(3)

0.1
X
=
0.25
0.125

0.25X=0.1×0.125

0.25X÷0.25=0.1×0.125÷0.25

X=0.05.

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