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
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.
为啥不是450~540,if 四舍五入的话
500 is the multiple of 100 that is closest to x为啥不写成x is the multiple of 100 that is closest to 500
500 is the multiple of 100 that is closest to x =500是(接近x的)一百的倍数-------450-550
400 is the multiple of 100 that is closest to y=400是(接近y的)一百的倍数------350-450
1+2》〉800
根据条件1和2可得 450 + 350 < x+y
首先,明确什么是500 is the multiple of 100 that is closest to x。There are lots of multiples of 100,eg 100, 200, 300, 400, 500, 600 etc, but 500 is THE ONE which is closest to X.
题干:已知450
看不懂题,容易迷惑的地方在于,that is closest to x和that is closest to y实际修饰的分别是400和500
题目相当于问X是四舍五入到500的百位,Y是四舍五入到400的百位
https://forum.chasedream.com/thread-358289-1-1.html
真是没看懂题,好可怕。
mark,不等式。
“500 is the multiple of 100 that is closest to x”转换为不等式就是“450≤x<550”
“400 is the multiple of 100 that is closest to y”转换为不等式就是“350≤y<450”
∴ 如果(1)成立,则450≤x<500,800≤x+y<950,无法确定其multiple of 100是800还是900
如果(2)成立,则350≤y<400, 800≤x+y<950,无法确定其multiple of 100是800还是900
如果(1)+(2),则800≤x+y<900,依然不知道该数是距离800近还是900近。
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500是最接近x的100的倍数 ,范围从450-550。
如果小于450,比如440,那400就比500更接近440;
若大于550,比如560,那600就更接近560,而不是550。
同理得出y的范围
本题错就错在没看到标色部分,
“500 is the multiple of 100 that is closest to x”转换为不等式就是“450≤x<550”
“400 is the multiple of 100 that is closest to y”转换为不等式就是“350≤y<450”
∴ 如果(1)成立,则450≤x<500,800≤x+y<950,无法确定其multiple of 100是800还是900
如果(2)成立,则350≤y<400, 800≤x+y<950,无法确定其multiple of 100是800还是900
如果(1)+(2),则800≤x+y<900,依然不知道该数是距离800近还是900近。
想问X在450与550之间是怎么得出的呢。。
我觉得主要是closest to A在数学方面的理解是表明在以A为中心的区间。这道题我也不太理解,后来去国外论坛看了别人的解答。类似的还有一些,我明天在og找找
哦哦!这题我看论坛上都是这个解答 但就是不理解呢
“500 is the multiple of 100 that is closest to x”转换为不等式就是“450≤x<550”
为啥是≤,不是
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100的倍数当中,x最接近于500,y最接近于400。问x+y最接近于100的倍数当中的哪一个?
条件一,x
题意就是x在450到550之间,y在350到450之间。当条件一成立,x范围为450到500之间,则x+y 的范围为800到950之间。可知结果可为800或者900.若条件二成立,则y的范围在350 到400之间,则则x+y 的范围为800到950之间,同样不足以退出答案。若两个条件同时成立,则x+y 的范围为800到900之间,任然不知道x+y是里800近还是离900近
100的倍数当中,x最接近于500,y最接近于400。问x+y最接近于100的倍数当中的哪一个?
条件一,x
100的倍数当中,x最接近于500,y最接近于400。问x+y最接近于100的倍数当中的哪一个?
条件一,x
这道题的题目没读懂,求解释
题目:450
500是所有100的倍数中最接近X的,400是所有100的倍数中最接近y的,问所有100的倍数中最接近x+y的是多少?