2乘X平方+3XY减2乘Y平方=0,XY不等于0,求X平方减Y平方分之3乘X平方+4XY加5乘Y平方的值

2x^2+3xy-2y^2=0(2x-y)(x+2y)=0y=2x或x=-2y当y=2x时(3x^2+4xy+5y^2)/(x^2-y^2)=[3x^2+4x*2x+5*(2x)^2]/[x^2-(2x)^2]=[3x^2+8x^2+20x^2]/[x^2-4x^2]=(31x^2)/(-3x^2)=-31/3当x=-2y时(3x^2+4xy+5y^2)/(x^2-y^2)=[3*(-2...