问题 解答题
4
5
x+
1
2
x=1
1
5
x+
1
4
=
7
8
x-
1
6
x=30.
答案

(1)

4
5
x+
1
2
x=1,

13
10
10
13
=1×
10
13

x=

10
13

(2)

1
5
x+
1
4
=
7
8

1
5
x+
1
4
-
1
4
=
7
8
-
1
4

1
5
x=
5
8

1
5
x×5=
5
8
×5,

x=

25
8

(3)x-

1
6
x=30,

5
6
x=30,

5
6
6
5
=30×
6
5

x=36.

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