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A为n阶矩阵, 证:tr(A^k)=A的各个特征值的k次方之和
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你能帮帮他们吗
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解释划线的词语。 ①结庐在人境 ②问君何能尔 ③直挂云帆济沧海 ④秋天漠漠向昏黑 ⑤瀚海阑干百丈冰 ⑥落红不是无情物
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If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _____ to the house next door.
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Many people are thinking of new ways to fight the pollution of the __________.
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Health problems are closely connected with bad eating habits and a _____ of exercise. [ ]
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