Is x between 0 and 1 ?
(1) x2 is less than x.
(2) x3 is positive.
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.
题目分析:
(1) 如果x≥1,则~$x^2$~≥x,不满足条件1;如果x≤0,则~$x^2≤x$~,不满足条件1;如果0<x<1,则满足~$x^2<x$~,满足题目,所以根据条件1可以判断0<x<1。
(2) ~$x^3$~ 是正的,x可以是任意大于0的数,并不能说明0<x<1,不满足要求。
因此,本题答案为(A),仅条件1可以解题,条件2不行。
x^2的隐含条件是>0!所以x>0!
1中x不可能是负数,因为x平方比x小,所以1就充分。
x=-0.3 就不在0
举个例子 如果x=-0.3 那第一个条件不就错了吗?
x=-0.3 就不在 0
不在0
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