4x的2次方-xy-3y的2次方=0(y不等于0),则2x/y

问题描述:

4x的2次方-xy-3y的2次方=0(y不等于0),则2x/y

4x^2-xy-3y^2=(4x+3y)(x-y)=0
x=y,x=-3y/4
2x/y=2或者-3/2