试题:
解方程.
(1)
2
3
x-
4
9
=
5
9
(2)x+30%x=52(3)
10
42
=
5
7
:x.
解方程 2016-05-21

答案:

我来补答
(1)
2
3
x-
4
9
=
5
9

2
3
x-
4
9
+
4
9
=
5
9
+
4
9

2
3
x=1,
2
3
2
3
=1÷
2
3

x=1
1
2

(2)x+30%x=52,
1.3x=52,
1.3x÷1.3=52÷1.3,
x=40;
(3)
10
42
=
5
7
:x,
10x=42×
5
7

10x=30,
10x÷10=30÷10,
x=3.
 
 
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