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数学
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1.(a+b)²=(a-b)²+( )2.(a+3b)(-a-3b)=( )
人气:265 ℃ 时间:2020-02-06 01:27:56
解答
(a+b)²=(a-b)²+(4ab )
(a+3b)(-a-3b)= -(a+3b ) ²
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