解比例. 0.5 X := 3 0.8 X:3.25= 1 5 : 5 4

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 .
2025-02-28 00:39:07
推荐回答(1个)
回答1:

(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.