[(x-y)(x+y)]^3怎么解,只学到了积的乘方,
问题描述:
[(x-y)(x+y)]^3怎么解,只学到了积的乘方,
答
[(x-y)(x+y)]^3=(x^2-y^2)^3=(x^4-y^4)(x^2-y^2)=x^6-x^4y^2-x^2y^4+y^6
[(x-y)(x+y)]^3怎么解,只学到了积的乘方,
[(x-y)(x+y)]^3=(x^2-y^2)^3=(x^4-y^4)(x^2-y^2)=x^6-x^4y^2-x^2y^4+y^6