问题 解答题
解方程.(温馨提醒:注意书写格式哦!)
5
8
=
x
12
x:2=0.25:
1
8
x+3x=2.4.
答案

(1)

5
8
=
x
12

8x=5×12,

8x=60,

8x÷8=60÷8,

x=7.5;

(2)x:2=0.25:

1
8

1
8
x=2×0.25,

1
8
1
8
=0.5÷
1
8

x=4;

(3)x+3x=2.4,

4x=2.4,

4x÷4=2.4÷4,

x=0.6.

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