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题库 / Prep2007E1-DS-97
Is ~$\sqrt{\left ( x-3 \right )^{2}}$~ = 3 - x ？
(1) ~$x\neq 3$~
(2) ~$-x\left | x \right |$~>0
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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根号下可以为0，但不能为负
根号n结果只指正平方根
根号下面的数只要是非负数就行了，可以等于0
2
已经说明x是负数了，则表明一定不为3
画图
题干从X=3分开 左右各两段
（2） X的定义域是X
From GMATClub: https://gmatclub.com/forum/is-sqrt-x-3-2-3-x-62992.html