问题 解答题
(1)x+
4
7
=1
(2)2x-
3
15
=
7
15
(3)x+(
1
3
+
3
4
)=2.
答案

(1)x+

4
7
=1,

x+

4
7
-
4
7
=1-
4
7

x=

3
7

(2)2x-

3
15
=
7
15

2x-

3
15
+
3
15
=
7
15
+
3
15

2x=

2
3

2x÷2=

2
3
÷2,

x=

1
3

(3)x+(

1
3
+
3
4
)=2,

x+

13
12
=2,

x+

13
12
-
13
12
=2-
13
12

x=

11
12

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