[Q. ] GWD4 Q21
If X<0,then(-X*|X|)的開根號is..
(A)-X
(B)-1
(C)1
(D)X
(E)根號X
答案:(A)
疑惑:根號裡就已經是正值了,為什麼開了個根號就變負呢?
作答時我選(D) 謝謝
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