AMC10 2004 A
AMC10 2004 A · Q4
AMC10 2004 A · Q4. It mainly tests Absolute value.
What is the value of $x$ if $|x-1| = |x-2|$?
如果$|x-1| = |x-2|$,$x$的值是多少?
(A)
-1/2
-$\frac{1}{2}$
(B)
1/2
$\frac{1}{2}$
(C)
1
1
(D)
3/2
$\frac{3}{2}$
(E)
2
2
Answer
Correct choice: (D)
正确答案:(D)
Solution
(D) The equation implies that either
$x-1=x-2$ or $x-1=-(x-2)$
The first equation has no solution, and the solution to the second equation is $x=\dfrac{3}{2}$.
(D)该方程意味着要么
$x-1=x-2$,要么 $x-1=-(x-2)$
第一个方程无解,第二个方程的解为 $x=\dfrac{3}{2}$。
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