(X加Y)的三次方如何开方
问题描述:
(X加Y)的三次方如何开方
答
(x+y)^3=(x+y)^2*(x+y)=(x^2+2xy+y^2)(x+y)=x^3+3x^2y+3xy^2+y^3
(X加Y)的三次方如何开方
(x+y)^3=(x+y)^2*(x+y)=(x^2+2xy+y^2)(x+y)=x^3+3x^2y+3xy^2+y^3