x²-8x+22
=x²-8x+16+6
=(x-4)²+6>0
得证
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用配方法证明：x²-8x+22的值恒大于0 x²-8x+22>0 (x-4)>-6
用配方法证明：x²-8x+22的值恒大于0 x²-8x+22>0 (x-4)>-6
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数学人气：494 ℃时间：2020-03-02 06:15:09
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