(2x减y)的平方减4(x减y)(x加2y)

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(2x减y)的平方减4(x减y)(x加2y)(2x减y)的平方减4(x减y)(x加2y)(2x减y)的平方减4(x减y)(x加2y)(2x-y)²-4(x-y)(x+2y)=(4x²

(2x减y)的平方减4(x减y)(x加2y)
(2x减y)的平方减4(x减y)(x加2y)

(2x减y)的平方减4(x减y)(x加2y)
(2x-y)²-4(x-y)(x+2y)
=(4x²-4xy+y²)-4(x²+xy-2y²)
=4x²-4xy+y²-4x²-4xy+8y²
=-8xy+9y²
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