问题 解答题
解方程
5
7
x-
1
5
=0
3
8
9
14
=
1
3

3
4
x+x=14.
答案

(1)

5
7
x-
1
5
=0,

5
7
x-
1
5
+
1
5
=0+
1
5

5
7
x=
1
5

5
7
7
5
=
1
5
×
7
5

x=

7
25

(2)

3
8
9
14
=
1
3

3
8
9
14
×
9
14
=
1
3
×
9
14

3
8
x=
3
14

3
8
8
3
=
3
14
×
8
3

x=

4
7

(3)

3
4
x+x=14,

3
4
+1)x=14,

7
4
x=14,

7
4
4
7
=14×
4
7

x=8.

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