题目内容

1
3
1
20
=
7
9
:X
1
2
:X=
1
6
3
5
5
7
÷
9
14
×
4
5
7
18
×
2
5
+
3
5
×
7
18
5
6
2
3
=
3
4
:x
2.25:12=a:41.5:8=
x
0.8
(1)
1
3
1
20
=
7
9
:x,
1
3
x=
1
20
×
7
9

1
3
x=
7
180

1
3
1
3
=
7
180
÷
1
3

x=
7
60


(2)
1
2
:x=
1
6
3
5

1
6
=
1
2
×
3
5

1
6
x=
3
10

1
6
1
6
=
3
10
÷
1
6

x=1
4
5


(3)
5
7
÷
9
14
×
4
5

=
5
7
×
14
9
×
4
5

=
8
9


(4)
7
18
×
2
5
+
3
5
×
7
18

=
7
18
×(
2
5
+
3
5
),
=
7
18
×1,
=
7
18


(5)
5
6
2
3
=
3
4
:x,
5
6
×x=
2
3
×
3
4

5
6
x=
1
2

5
6
5
6
=
1
2
÷
5
6

x=
3
5


(6)2.25:12=a:4,
12×a=2.25×4,
12a=9,
12a÷12=9÷12,
a=
3
4


(7)1.5:8=
x
0.8

8×x=1.5×0.8,
8x=1.2,
8x÷8=1.2÷8,
x=0.15.
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