英语翻译6.Since you cannot take the square root of anegative num

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英语翻译
6.Since you cannot take the square root of anegative number,you might use which of the following instructions to find thesquare root of the variable
a) Math.sqrt(x*x);
b) Math.sqrt((int) x);
c) Math.sqrt(Math.abs(x));
d) Math.abs(Math.sqrt(x));

选c,题目说如果对一个数求平方根的话,但是这个数有可能是负数,那么如下哪种方式可以保证结果正确
Math.abs是去取绝对值的,所以可以保证

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