Question

y/(x+y)=(10-x)/[5/8(16-x)] 这个怎么化成函数?

Answer 1

y/(x+y)=(10-x)/[5/8(16-x)]=8(10-x)/5(16-x)

y/(x+y)=(8x-80)/(5x-80)

y/(x+y)-1=(8x-80)/(5x-80)-1

-x/(x+y)=3x/(5x-80)

所以x+y=-(5x-80)/3

y=(-5x+80)/3-x

y=(-8x+80)/3