题目内容

解比例.
0.5
X
:=
3
0.8
X:3.25=
1
5
5
4
3
4
:X=3:12
0.7
X
=
14
5
(1)
0.5
X
=
3
0.8

3X=0.5×0.8,
3X÷3=0.4÷3,
X=
2
15


(2)X:3.25=
1
5
5
4

5
4
X=3.25×
1
5

5
4
4
5
=0.65×
4
5

X=0.52.

(3)
3
4
:X=3:12,
3X=12×
3
4

3X÷3=9÷3,
X=3;

(4)
0.7
X
=
14
5

14X=0.7×5,
14X÷14=3.5÷14,
X=0.25.
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