题目内容

5
x
=
12
8.4
1
8
1
5
=x:1.6
x:
1
2
=
2
3
:4
0.8:
1
4
=x:8
1.25:0.25=
x
1.6
(x+3):48=9:54.
(1)
5
x
=
12
8.4

12x=5×8.4,
12x÷12=42÷12,
x=3.5;

(2)
1
8
1
5
=x:1.6,
1
5
x=
1
8
×
1.6,
1
5
x÷
1
5
=0.2÷
1
5

x=1;

(3)x:
1
2
=
2
3
:4,
4x=
1
2
×
2
3

4x÷4=
1
3
÷
4,
x=
1
12


(4)0.8:
1
4
=x:8,
1
4
x=0.8×8,
1
4
x÷
1
4
=6.4÷
1
4

x=25.6;

(5)1.25:0.25=
x
1.6

0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8;

(6)(x+3):48=9:54,
(x+3)×54=48×9,
54x+162-162=432-162,
54x÷54=270÷54,
x=5.
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