解比例. 21 X = 32 8 X:12= 7 4 :2.8 1

解比例. 21 X = 32 8 X:12= 7 4 :2.8 1 20 : 1 5 =X: 1 4 .
2025-06-27 14:57:33
推荐回答(1个)
回答1:

21
X
=
32
8

32x=21×8
32x=168
x=
21
4


X:12=
7
4
:2.8
2.8x=12×
7
4

2.8x=21
x=7.5;
         
1
20
1
5
=X:
1
4

1
5
x=
1
20
×
1
4

1
5
x=
1
80

x=
1
16