问题 解答题
解方程
14
15
=
1
7

3
4
x=48
22x-
3
40
=
19
40

3
4
-2x=
1
4
答案

(1)x÷

14
15
=
1
7

14
15
×
14
15
=
1
7
×
14
15

x=

2
15

(2)

3
4
x=48

3
4
x÷
3
4
=48÷
3
4

x=64;

(3)22x-

3
40
=
19
40

22x-

3
40
+
3
40
=
19
40
+
3
40

22x=

11
20

22x÷22=

11
20
÷22

x=

1
40

(4)

3
4
-2x=
1
4

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

3
4
=
1
4
+2x

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

1
2
=2x

1
2
÷2=2x÷2

x=

1
4

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