问题 解答题
解方程.
2
3
-2x=
5
9

4
3
x×5+
4
3
=13
答案

(1)

2
3
-2x=
5
9

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

2
3
=
5
9
+2x,

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

1
9
=2x,

1
9
÷2=2x÷2,

x=

1
18

(2)

4
3
x×5+
4
3
=13,

20
3
x+
4
3
=13,

20
3
x+
4
3
-
4
3
=13-
4
3

20
3
x=
35
3

20
3
20
3
=
35
3
÷
20
3

x=

7
4

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