当ab=9,a-b=-3时,
原式=(a-b)2+5ab=(-3)2+45=54.
已知ab=9,a-b=-3,则a2+3ab+b2的值为_.
已知ab=9,a-b=-3,则a2+3ab+b2的值为______.
数学人气:661 ℃时间:2019-10-11 05:26:24
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