试题:
求未知数
3
5
×
1
2
-X=
1
5
5
6
×
1
5
-
1
3
X=
1
18
5X+4×0.6=7.4X-
5
8
×
4
5
=
1
3
解方程 2016-05-21

答案:

我来补答
(1)
3
5
×
1
2
-X=
1
5

3
10
-x=
1
5

3
10
-x+x=
1
5
+x,
3
10
-
1
5
=
1
5
+x-
1
5

x=
1
10


(2)
5
6
×
1
5
-
1
3
X=
1
18

1
6
-
1
3
x+
1
3
x=
1
18
+
1
3
x,
1
6
-
1
18
=
1
18
+
1
3
x-
1
18

1
9
=
1
3
x,
1
9
÷
1
3
=
1
3
x÷
1
3

x=
1
3


(3)5X+4×0.6=7.4,
5x+2.4=7.4,
5x+2.4-2.4=7.4-2.4,
5x=5,
5x÷5=5÷5,
x=1;

(4)X-
5
8
×
4
5
=
1
3

x-
1
2
=
1
3

x-
1
2
+
1
2
=
1
3
+
1
2

x=
5
6
 
 
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