已知x-5y=0,求分式【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)的值

问题描述:

已知x-5y=0,求分式【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)的值

14321我电话那两块钱的

x-5y=0,
x=5y
【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)
=(3x+y)/(y-x)² ×(y-x)
=(3x+y)/(y-x)
=(15y+y)/(y-5y)
=-4