题目内容

计算:
(1)
1
2
2
3
=9:x
(2)x:1.2=
2
3
:5
(3)
x
25
=
1.2
1.5
(4)
1
10
:x=
1
8
1
4
(5)
2
5
:x=
4
5
:4
(6)
x
14
=
3
7
(1)
1
2
2
3
=9:x,
1
2
x=
2
3
×9,
1
2
x=6,
1
2
1
2
=6÷
1
2

x=12;

(2)x:1.2=
2
3
:5,
5x=1.2×
2
3

5x=0.8,
5x÷5=0.8÷5,
x=0.16;

(3)
x
25
=
1.2
1.5

1.5x=25×1.2,
1.5x=30,
1.5x÷1.5=30÷1.5,
x=20;


(4)
1
10
:x=
1
8
1
4

1
8
x=
1
10
×
1
4

1
8
x=
1
40

1
8
1
8
=
1
40
÷
1
8

x=
1
5


(5)
2
5
:x=
4
5
:4,
4
5
x=
2
5
×4,
4
5
x=
8
5

4
5
4
5
=
8
5
÷
4
5

x=2;

(6)
x
14
=
3
7

7x=14×3,
7x=42,
7x÷7=42÷7,
x=6.
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