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数学
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a²-2ab=3 b²-ab=4 求-2a²+ab+3b²
人气:330 ℃ 时间:2020-06-20 14:59:22
解答
-2a²+ab+3b² = -2(a²-2ab)+3b²-3ab = -2x3 + 3x4 = 6
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