解方程. 60%X+30%X=18 (1-25%)X=25 50+20%X=80

解方程. 60%X+30%X=18 (1-25%)X=25 50+20%X=80.
2025-01-13 04:20:21
推荐回答(1个)
回答1:

(1)60%X+30% X=18,
0.9x=18,
0.9x÷0.9=18÷0.9,
x=20;

(2)(1-25%)X=25,
3
4
x=25,
3
4
4
3
=25×
4
3

x=33
1
3


(3)50+20% X=80,
50-50+20% X=80-50,
1
5
x×5=30×5,
x=150;