解方程. 4 25 ÷x=0.8 3

解方程. 4 25 ÷x=0.8 3 5 x+5×4=95x- 3 4 x-4=18.
2025-12-14 07:33:12
推荐回答(1个)
回答1:

(1)
4
25
÷x=0.8,
4
25
÷x×x=
4
5
×x,
4
5
x=
4
25

4
5
x=
4
25

4
5
4
5
=
4
25
÷
4
5

x=
4
25
×
5
4

x=
1
5


(2)
3
5
x+5×4=95,
3
5
x+20=95,
3
5
x+20-20=95-20,
3
5
x=75,
3
5
3
5
=75÷
3
5

x=75×
5
3

x=125;

(3)x-
3
4
x-4=18,
(1-
3
4
)x-4+4=18-4,
1
4
x=14,
1
4
x×4=14×4,
x=56.