(2x-y)的平方-4(x+y)(x+2y) 速度、要过程,

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(2x-y)的平方-4(x+y)(x+2y)速度、要过程,(2x-y)的平方-4(x+y)(x+2y)速度、要过程,(2x-y)的平方-4(x+y)(x+2y)速度、要过程,=4x方-4xy+y方-4

(2x-y)的平方-4(x+y)(x+2y) 速度、要过程,
(2x-y)的平方-4(x+y)(x+2y) 速度、要过程,

(2x-y)的平方-4(x+y)(x+2y) 速度、要过程,
=4x方-4xy+y方-4(x方+2xy+xy+2y方)
=4x方-4xy+y方-4x方-12xy-8y方
=-16xy-7y方

(2x-y)²-4(x+y)(x+2y)
=4x²-4xy+y²-4(x²+3xy+2y²)
=4x²-4xy+y²-4x²-12xy-8y²
=-16xy-7y²