问题 解答题
5
8
X=40;
X:
4
7
=
2
3
2
5
X=
4
9
×
3
8
3
5
x-
4
7
+
3
7
=1;
4
5
+3.2)x=
2
3
答案

(1)

5
8
X=40

5
8
8
5
=40×
8
5

X=64;

(2)X:

4
7
=
2
3

X=

4
7
×
2
3

X=

8
21

(3)

2
5
X=
4
9
×
3
8

2
5
X=
1
6

2
5
5
2
=
1
6
×
5
2

X=

5
12

(4)

3
5
x-
4
7
+
3
7
=1

3
5
x-
1
7
=1

3
5
x-
1
7
+
1
7
=1+
1
7

3
5
x=
8
7

3
5
5
3
=
8
7
×
5
3

x=

40
21

(5)(

4
5
+3.2)x=
2
3

(0.8+3.2)x=

2
3

4x=

2
3

4x÷4=

2
3
÷4

x=

1
6

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