题库搜索>问题求解PS-12360
If x < 0, then √(−x·|x|) is
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x的绝对值应该等于-x（因为x<0）
所以sqrt（-x）的平方就应该是个正数：-x
灭绝人性
这题绝对有问题 最后开完根号是正数 怎么又变负X。。。。
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2020-11-09 15:01:23
166801tog回复灭绝人性
开完根号是正数 x是负数 所以是-x
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2021-10-03 15:32:22
citycorner
因 x < 0 ，√(-x│x│) 带入任何负数：x = -2 可求： √(-x│x│) = √(-)(-2)│-2│) = √(2*2) = 2 = - (-2) = - (x)
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2019-02-08 23:15:43
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