题目内容

X:
5
14
=
3
10
7
20
4
X
=
1
3
:30%
4
7
÷
4
21
×X=
8
9
2
7
×
5
8
=
1
8
÷
3
4
=
125×1.6=12.56÷6.28=
1
7
÷7×
1
7
=
4
5
-
1
3
=
3.14×5=3.14×40=75×10%=
1
3
÷3-
1
9
=
(1)x:
5
14
=
3
10
7
20

7
20
x=
5
14
×
3
10

7
20
20
7
=
3
28
×
20
7

x=
15
49


(2)
4
X
=
1
3
:30%,
1
3
x=4×30%,
1
3
x
×3=1.2×3,
x=3.6;

(3)
4
7
÷
4
21
×x=
8
9

3x=
8
9

3x÷3=
8
9
÷3,
x=
8
27


(4)
2
7
×
5
8
=
5
28


(5)
1
8
÷
3
4
=
1
6


(6)125×1.6=200;

(7)12.56÷6.28=2;

(8)7×
1
7
÷7×
1
7

=1÷7×
1
7

=
1
7
×
1
7

=
1
49


(9)
4
5
-
1
3
=
7
15


(10)3.14×5=15.7;

(11)3.14×40=125.6;

(12)75×10%=7.5;

(13)
1
3
÷3-
1
9

=
1
9
-
1
9

=0.
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