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数学
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若a-b=2,则a2+b2/2-ab
人气：416 ℃ 时间：2020-03-21 20:51:48
解答
a-b=2
(a²+b²)/2 -ab
=(a²+b²-2ab)/2
=(a-b)²/2
=2²/2
=2
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