问题 解答题
解方程:
x+
5
9
=1
x-(
3
14
+
4
7
)=
1
2
3
4
+x=
7
8
答案

(1)x+

5
9
=1,

x+

5
9
-
5
9
=1-
5
9

x=

4
9

(2)x-(

3
14
+
4
7
)=
1
2

x-

11
14
=
1
2

x-

11
14
+
11
14
=
1
2
+
11
14

x=

9
7

(3)

3
4
+x=
7
8

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

x=

1
8

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