解比例: 0.8:4=x:8 1 2 : 1 5 = 1 4 :x 4 x =

解比例: 0.8:4=x:8 1 2 : 1 5 = 1 4 :x 4 x = 5 6 1.2 2.5 = 3 x .
2024-12-19 06:06:16
推荐回答(1个)
回答1:

(1)0.8:4=x:8,
4x=0.8×8,
4x=6.4,
4x÷4=6.4÷4,
x=1.6;

(2)
1
2
1
5
=
1
4
:x,
1
2
x=
1
5
×
1
4

1
2
x ÷
1
2
=
1
20
÷
1
2

x=
1
10


(3)
4
x
=
5
6

5x=4×6,
5x÷5=24÷5,
x=4.8;

(4)
1.2
2.5
=
3
x

1.2x=2.5×3,
1.2x=7.5,
1.2x÷1.2=7.5÷1.2,
x=6.25.