计算:(2x-y+2)(2x-y-2)
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计算:(2x-y+2)(2x-y-2)计算:(2x-y+2)(2x-y-2)计算:(2x-y+2)(2x-y-2)解析根据平方差公式（2x-y+2)(2x-y-2)=(2x-y)²-4=4x
计算:(2x-y+2)(2x-y-2)
计算:(2x-y+2)(2x-y-2)
计算:(2x-y+2)(2x-y-2)
解析
根据平方差公式
（2x-y+2)(2x-y-2)
=(2x-y)²-4
=4x²-4xy+y²-4
(2x-y+2)(2x-y-2)
=[(2x-y)+2][(2x-y)-2]
=(2x-y)²-2²
=4x²-4xy+y²-4
原式=【(2x-y）+2】【(2x-y）-2】=(2x-y）平方-4=4x平方-4xy+y平方-4
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