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工作学习 / English / 问道很菜的GMAT数学题: -7<=a<=10, -9<=b<=5, what is the least possible value of a2-b2(A平方减B平方)? A)75 B)24 C)-33 D)-81 E)-130
-labelle(桃谷小仙);
2002-10-17
(#803239@0)
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-81
-jeffrey815(Smartiecat);
2002-10-17
(#803256@0)
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可以告诉以下解题思路吗?脑子僵化了:-(
-labelle(桃谷小仙);
2002-10-17
(#803262@0)
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我在解GMAT数学中关于THE ＬＥＡＳＴ POSSIBLE的题得出的正确答案往往是THE ＭＯＳＴ ＰＯＳＳＩＢＬＥ的，不知道我的思路错在哪儿了：－（
-labelle(桃谷小仙);
2002-10-17
(#803271@0)
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Least possible of a2 - b2 means you want the least of a2 and the max of b2. So the least of a2 is 0 and the max of b2 is 81.
-jeffrey815(Smartiecat);
2002-10-17
(#803276@0)
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万分感谢!一语惊醒梦中人!
-labelle(桃谷小仙);
2002-10-17
(#803284@0)
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e.
-ltjt86(tyson~书中自有颜如玉);
2002-10-17
(#803263@0)
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why e?
-jeffrey815(Smartiecat);
2002-10-17
(#803272@0)
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没看我下面的解释吗?
-ltjt86(tyson~书中自有颜如玉);
2002-10-17
(#803279@0)
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a的绝对值从0-10,b是从0-9.平方差不可能超出100.
-ltjt86(tyson~书中自有颜如玉);
2002-10-17
(#803268@0)
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But how can it be e? -130?
-jeffrey815(Smartiecat);
2002-10-17
(#803293@0)
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？？？俺也想知道，俺的答案怎么和jeffrey815同学一样?
-rainrain(雨雨 雁字回时);
2002-10-17
(#803302@0)
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没研究过GMAT,我开始认为的least possible是impossible的意思.
-ltjt86(tyson~书中自有颜如玉);
2002-10-18
(#803436@0)
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JEFFREY815是对的,不过也谢谢其他人的参与.
-labelle(桃谷小仙);
2002-10-17
(#803321@0)
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D
-gettext(gettext);
2002-10-18
(#803410@0)