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AMC12 2000 A

AMC12 2000 A · Q5

AMC12 2000 A · Q5. It mainly tests Absolute value.

If $|x - 2| = p$, where $x < 2$, then $x - p =$
如果 $|x - 2| = p$,其中 $x < 2$,则 $x - p =$
(A) −2 $-2$
(B) 2 2
(C) 2 − 2p $2-2p$
(D) 2p − 2 $2p-2$
(E) |2p − 2| $|2p-2|$
Answer
Correct choice: (C)
正确答案:(C)
Solution
When $x < 2,$ $x-2$ is negative so $|x - 2| = 2-x = p$ and $x = 2-p$. Thus $x-p = (2-p)-p = 2-2p$. $\boxed{\mathbf{(C)}}$
当 $x < 2,$ 时,$x-2$ 为负,所以 $|x - 2| = 2-x = p$,从而 $x = 2-p$。 因此 $x-p = (2-p)-p = 2-2p$。 $\boxed{\mathbf{(C)}}$
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