Is ~$\sqrt{\left ( x-5 \right )^{2}}=5-x$~ ?
(1) ~$-x\left | x \right |> 0$~
(2) ~$5-x> 0$~
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.
区分必要非充分和充分非必要
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只需 x < 5 条件1 x < 0
x
条件1 得出 x