标题: 一题数学PREP [打印本页]

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作者: victoria820    时间: 2010-5-4 07:13     标题: 一题数学PREP

If X is equal to the sum of the even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, what is the value of x+y?
550
551
560
561
572

我算出来X是550，但是X+Y不知道怎么办了？

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作者: xiao19870205    时间: 2010-5-4 22:07

y=11
x=550
x+y=561

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作者: victoria820    时间: 2010-5-5 06:39

啊~我把Y理解错了。。。谢了哈

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