若(x^2-y^2分之M)=(x^2-y^2分之2xy-y^2)+(x+y分之x-y),则M=多少
问题描述:
若(x^2-y^2分之M)=(x^2-y^2分之2xy-y^2)+(x+y分之x-y),则M=多少
答
(x^2-y^2分之M)=(x^2-y^2分之2xy-y^2)+(x+y分之x-y),M/(x²-y²)=(2xy-y²)/(x-y)(x+y)+(x-y)/(x+y)M/(x-y)(x+y)=(2xy-y²+x²-2xy+y²)/(x-y)(x+y)M/(x-y)(x+y)=x²/(x-y)(x+y)∴M=...