已知,4x^2-xy-3y^2=0 求2x/y.和 x+2y/x-2y
问题描述:
已知,4x^2-xy-3y^2=0 求2x/y.和 x+2y/x-2y
答
4x^2-xy-3y^2=0(4x+3y)(x-y)=04x+3y=0或x-y=0x= -3/4 y 或x=y当x=y时,(x+2y)/(x-2y)=3y/(-y)= -3当x= -3/4y时,(x+2y)/(x-2y)=(-3/4y+2y)/(-3/4y-2y)=5/4y)/(-11/4 y)= -5/11...