已知 a+b=3 ， ab=−3 , 则 a2+b2 的值是_1．_刷题宝

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已知 a+b=3 ， ab=−3 , 则 a2+b2 的值是____．

上一题下一题 0.0难度选择题更新时间:2019-03-10 11:05:28

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15

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