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题库 / Prep2007E2-DS-202
The numbers x and y are not integers. The value of x is closest to which integer?
(1) 4 is the integer that is closest to x + y.
(2) 1 is the integer that is closest to x - y.
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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带小数的数离哪个整数最近？利用四舍五入的原理：
x+y的范围是 (3.5~4.4)
x-y的范围是(0.5~1.4)
二者相加=2x，x的范围可以通过2x的范围求出。求二者相加的范围是1里的极小值+2里的极小值～1的极大值+2里的极大值，是 (4~5.8), x的范围是(2,2.9)，对应的最接近的整数分别是2和3，不确定。
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