解比例.1.5:12=6:x x: 3 5 = 5 6 :2 1.3 3.9 = 20 x

2024-11-01 05:06:39
推荐回答(1个)
回答1:


(1)1.5:12=6:x,
1.5x=12×6,
1.5x=72,
1.5x÷1.5=72÷1.5,
x=48;

(2)x:
3
5
=
5
6
:2,
2x=
3
5
×
5
6

2x=
1
2

2x÷2=
1
2
÷2,
x=
1
4


(3)
1.3
3.9
=
20
x

1.3x=20×3.9,
1.3x=78,
1.3x÷1.3=78÷1.3,
x=60;

(4)x:
24
7
=0.875:5,
5x=
24
7
×0.875,
5x=3,
5x÷5=3÷5,
x=0.6;

(5)
2
3
5
6
=x:0.5,
5
6
x=
2
3
×0.5,
5
6
x=
1
3

5
6
5
6
=
1
3
÷
5
6

x=
2
5


(6)
x
0.15
=
0.4
0.03

0.03x=0.15×0.4,
0.03x=0.06,
0.03x÷0.03=0.06÷0.03,
x=2.