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無聊改卷後

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二次方程某基本題:

Suppose 2x^2-4x-a+1\ge 0 for any real value of x, find the range of values of a.

某同學的解:

The inequality holds for any real value of x, so we may put x=1, yield

2-4-a+1\ge 0

\Rightarrow a\le -1

得到正確答案,可惜方法不對

johnmayhk-sosad



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