Re: [計量] 幾題計量問題??
看板GRE (GRE入學考試)作者startend (Pride & Prejudice)時間16年前 (2010/04/05 20:02)推噓0(0推 0噓 0→)留言0則, 0人參與討論串2/3 (看更多)
※ 引述《tako1016 (Tako)》之銘言：
: 不好意思
: 又要請各位幫忙了
:
: 4. Two circles of radius 2 are centered at (2,0) and at (0,2) in the xy-plane,
: what is the area of the intersection of the interiors of the two circles?
: Ans: 2(pi-2)
簡略的畫圖以後會發現該交叉處，是兩個四分之一圓相加然後減掉邊長為2的正方形
所以是1/4*2^2pi*2 - 2*2
: 5. When 2/9 of the votes on a certain resolution have been counted, 3/4 of
: those counted are in favor of the resolution. What fraction of the
: remaining voted must be against the resolution so that the total count will
: result in a vote of 2 to 1 against the resolution?
: Ans:11/14
這種題目通常做個小表格就蠻容易了解的
最後的結果是against的人會佔2/3
所以2/3＝2/9*1/4+x*7/9 x＝the fractino of the remaining voted who against R
可得x＝11/14
其他的就要麻煩其他高手了，因為我也解不出來 XD
加油！
: 又要請各位幫忙了
: 真的很謝謝你們
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