问题 解答题
解方程.
3
5
x-
4
7
+
3
7
=1(
4
5
+3.2)x=
2
3
答案

(1)

3
5
x-
4
7
+
3
7
=1,

3
5
x-(
4
7
-
3
7
)=1,

3
5
x-
1
7
=1,

3
5
x-
1
7
+
1
7
=1+
1
7

3
5
x=
8
7

3
5
5
3
=
8
7
×
5
3

x=

40
21

(2)(

4
5
+3.2)x=
2
3

(0.8+3.2)x=

2
3

4x=

2
3

4x×

1
4
=
2
3
×
1
4

x=

1
6

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