问题 解答题
解方程.
1-
2
3
X=
1
3
2
3
÷X=
1
6
3
4
1
6
=
5
9
X-
1
2
=
3
4
X.
答案

(1)1-

2
3
x=
1
3

1-

2
3
x+
2
3
x=
1
3
+
2
3
x,

1-

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

2
3
÷
2
3
=
2
3
x÷
2
3

x=1;

(2)

2
3
÷x=
1
6

2
3
÷x×x=
1
6
×x,

2
3
÷
1
6
=
1
6
x÷
1
6

x=4;

(3)

3
4
1
6
=
5
9

3
4
1
6
×
1
6
=
5
9
×
1
6

3
4
x÷
3
4
=
5
54
÷
3
4

x=

10
81

(4)x-

1
2
=
3
4
x,

x-

1
2
+
1
2
=
3
4
x+
1
2

x-

3
4
x=
3
4
x+
1
2
-
3
4
x,

1
4
x÷
1
4
=
1
2
÷
1
4

x=2.

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