题目内容

1÷2x=
1
2

5
7
-
10
21
x=
5
14

6
5
3
7
=
7
3

x-
5
8
x=15
x×20%=20
6
7
×
9
14
=
3
4
(1)1÷2x=
1
2

1÷2x×2x=
1
2
×2x,
x=1;

(2)
5
7
-
10
21
x=
5
14

5
7
-
10
21
x+
10
21
x=
5
14
+
10
21
x,
10
21
x+
5
14
=
5
7

10
21
x+
5
14
-
5
14
=
5
7
-
5
14

10
21
x=
5
14

10
21
10
21
=
5
14
÷
10
21

x=
5
14
×
21
10

x=
3
4


(3)
6
5
3
7
=
7
3

6
5
3
7
×
3
7
=
7
3
×
3
7

6
5
x=1,
6
5
6
5
=1÷
6
5

x=
5
6


(4)x-
5
8
x=15,
(1-
5
8
)x=15,
3
8
x=15,
3
8
3
8
=15÷
3
8

x=15×
8
3

x=40;

(5)x×20%=20,
0.2x=20,
0.2x÷0.2=20÷0.2,
x=100;

(6)x÷
6
7
×
9
14
=
3
4

7
6
×
9
14
=
3
4

3
4
=
3
4

3
4
÷
3
4
=
3
4
÷
3
4

x=1.
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