Question

(x*40%+y*10%)/(x+y)=30%怎么解

Answer 1

(x*40%+y*10%)/(x+y)=30%
解： (2/5*x+1/10*y)/(X+y)=3/10
2/5*x+1/10*y=3/10*x+3/10*y
1/10*x=2/10*y
x=2y

Answer 2

同乘10
4x+y=3x+3y

2y=x
x<>-y得x<>0;

Answer 3

您好O(∩_∩)O~ 这个解不出数字 只能解出X与Y的关系 0.4x+0.1y = 0.3(x+y) 0.1x = 0.2 y x= 2y