a^2-3ab+b^2
=a²+2ab+b²-5ab
=(a+b)²-5ab
=6²-35
=36-35
=1
已知a+b=6 ab=7則a^2-3ab+b^2=_____
已知a+b=6 ab=7則a^2-3ab+b^2=_____
其他人氣：198 ℃時間：2020-06-02 04:51:26
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