问题 解答题
解方程.
3
4
x+
1
8
=
1
2

0.75:x=1.25:0.25.
答案

(1)

3
4
x+
1
8
=
1
2

3
4
x+
1
8
-
1
8
=
1
2
-
1
8

3
4
x=
3
8

3
4
x÷
3
4
=
3
8
÷
3
4

x=

1
2

(2)0.75:x=1.25:0.25,

1.25x=0.75×0.25,

1.25x=0.1875,

1.25x÷1.25=0.1875÷1.25,

x=0.15.

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