2a(a+b)-(a+b)(a+b) a=根号2010 b=根号2009 化简,求值

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2a(a+b)-(a+b)(a+b)
=(2a²+2ab)-(a²+2ab+b²兄槐)
=2a²+2ab-a²羡郑友-2ab-b²
=a²-b²
=(√丛胡2010)²-(√2009)²
=2010-2009
=1

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2a(a+b)-(a+b)(a+b)
=(2a²+2ab)-(a²+2ab+b²)
=2a²+2ab-a²-2ab-b²
=a²-b²
=(根号2010)²丛胡-(根号2009)²羡郑友兄槐
=2010-2009
=1

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原式化简得（a+b）(a-b)=a^2-b^2=2010-2009=1

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=2a^2+2ab-a^2-2ab-b^2
=a^2-b^2
=2010-2009
=1

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