已知y=x^2-3xy-2y^2/2y.求x:y的值
问题描述:
已知y=x^2-3xy-2y^2/2y.求x:y的值
答
x^2-3xy-2y^2=2y^2
x^2-3xy-4y^2=(x+y)(x-4y)=0
x=-y,x=4y
x:y=-1,x:y=4