need help prep DS2 202, thx

shanefeng · 发表于 2010-1-4 00:14:27

202. 19378-!-item-!-187;#058&012570
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.

the key is E

I got C, here is my solution:
(1)-> 3.5<= x+y< 4.5
(2)-> .5<= x-y<1.5
(1)+(2)-> 4<=2x<6
-> 2<= x <3
so 2 is the closet integer.

仙蒂瑞拉 · 发表于 2010-1-4 00:37:33

LZ你自己已经解出来了呀。。
2<=x<3.若2<=x<2.5那和x最接近的整数就是2，若 2.5<=x<3那最接近整数就是3了。

shanefeng · 发表于 2010-1-4 05:37:59

... zui jin yun le

thanks

need help prep DS2 202, thx

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