解比例 0.75 x = 3 2 ;x:1 3 5 = 5 8 :1 3 4

解比例 0.75 x = 3 2 ;x:1 3 5 = 5 8 :1 3 4 ; 2 9 : 5 9 =0.4:x; 1.25 0.25 = x 8 .
2025-01-02 01:09:27
推荐回答(1个)
回答1:

(1)
0.75
x
=
3
2

3x=0.75×2,
3x=1.5,
3x÷3=1.5÷3,
x=0.5;

(2)x:1
3
5
=
5
8
:1
3
4

1
3
4
x=1
3
5
×
5
8

1
3
4
x=1,
1
3
4
x÷1
3
4
=1÷1
3
4

x=
4
7


(3)
2
9
5
9
=0.4:x,
2
9
x=
5
9
×0.4,
2
9
x ÷
2
9
=
2
9
÷
2
9

x=1;

(4)
1.25
0.25
=
x
8

0.25x=1.25×8,
0.25x=10,
0.25x÷0.25=10÷0.25,
x=40.