Hằng đẳng thức!ai biết thì chỉ nhanh gấp

H

happy.swan

$x^3 + y^3 = (x + y)(x^2 - xy + y^2)$

$x^4 + y^4 = (x^2 + y^2)^2 - 2x^2y^2 = (x^2 + y^2 + \sqrt{2}xy)(x^2 + y^2 - \sqrt{2}xy) $

 
T

thinhrost1

$x^5+y^5=y^5-y^4x+y^3x^2-y^2x^3+yx^4+xy^4-x^2y^3+x^3y^2-x^4y+x^5=(y+x)(y^4-xy^3+x^2y^2-x^3y+x^4)$
 
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