已知a-b=5,ab=6,求2a²+5ab+2b²
人气:136 ℃ 时间:2020-04-13 04:18:03
解答
2a²+5ab+2b²
=2a²-4ab+2b²+9ab
=2(a-b)^2+9ab
=2*5^2+9*6
=2*25+54
=50+54
=104
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