Baby姐厉害啊~解释的我一下就看懂；了~~~！！
"500 is the multiple of 100 that is closest to x" means 450<x<550 (I) "400 is the multiple of 100 that is closest to y" means 350<y<450 (II) Even if we combine (1) and (2) to get 450<x<500 350<y<400 Add up, 800<(x+y)<900 We still don't know whether 800 or 900 is the multiple of 100 that closest to (x+y). Therefore the correct answer should be E.
If 500 is the multiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y, which multiple of 100 is closest to x + y ? (1) x < 500 (2) y < 400 题目是什么意思呀？ -- by 会员 melody远行 (2012/4/3 10:26:21)
-- by 会员 babybearmm (2012/4/4 7:38:30)
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发表于 2012-4-3 10:26:21
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发表于 2012-4-4 07:38:30