问题 解答题
解方程.
5
12
+
1
3
+x=
7
8
(x-
4
7
)
÷2=1.5
x-
2
9
=
2
3
+
1
2
答案

(1)

5
12
+
1
3
+x=
7
8

3
4
+x=
7
8

3
4
+x-
3
4
=
7
8
-
3
4

x=

1
8

(2)(x-

4
7
)÷2=1.5,

(x-

4
7
)÷2×2=1.5×2,

x-

4
7
=3,

x-

4
7
+
4
7
=3+
4
7

x=3

4
7

(3)x-

2
9
=
2
3
+
1
2

x-

2
9
=
7
6

x-

2
9
+
2
9
=
7
6
+
2
9

x=

25
18

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