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本題由chris提供
If x < 0, then √(?x·|x|) ? is
A. -x
B. -1
C. 1
D. x
E. √x ?
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答案：
A
x的絕對(duì)?
所以sqrt（-x）的平方就應(yīng)該是個(gè)正數(shù)：-x
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