(x+2y)².(2y+x)³+(-x-2y)^5=化简:(x+2y)²*(2y+x)³+(-x-2y)^5

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(x+2y)².(2y+x)³+(-x-2y)^5=
化简:(x+2y)²*(2y+x)³+(-x-2y)^5

(x+2y)²*(2y+x)³+(-x-2y)^5
= (x + 2y)^2 * ( x + 2y)^3 + [ (-1)(x + 2y)]^5
= (x + 2y)^(2 + 3) + (-1)^5(x + 2y)^5
= (x + 2y)^5 - (x + 2y)^5
= 0