Re: [計量] 請教10/28印度JJ
※ 引述《icecrystal (ice)》之銘言:
: http://www.drrajusgre.com/forum/viewtopic.php?t=7228
: 1.Given that three sides of the rectangle RS, ST, and TW as the tangent to
: the two circles whose centers are 'A' and 'B'.If 'C' is the circumfrance
: of each circle, then what is the area of the rectangle RSTW?
: (詳細圖形麻煩參考網站 我不會畫圖 >"<)
: A. (1/2)*(C/n)^2
: B. (3/4)*(C/n)^2
: C. (1/4)*(C/n)^2
: & so on......
A,B 兩個圓的周長都是C,所以它們的半徑都是 C/2pi,
由圖可知矩形長為3倍的半徑,寬為圓的直徑長,
所以面積就是 3*C/2pi x C/pi = (3/2)*(C/pi)^2
: 6. Col. [sqrt(28)/sqrt(112)]-[sqrt(7)/sqrt(112)]
: Col. 1/4
: 這題答案是C 但是我不清楚該怎樣算 麻煩板上各位高手幫忙
化開=> sqrt(1/4) - sqrt(1/16) = 1/4
: 7. Last year, 1/4 of factory workers are architests. One year ago 60 workers
: newly joined in which 50 are atchitects and no one left the factory since
: last year and if now 1/3 of factory workers are atchitects then find the
: total number of workers?
: 這題也麻煩大家幫忙了 我想好久 算是不知該怎麼列
: 題目一開始說last year 後來又提到one year ago <---- 不就是last year 嗎
: 感覺他轉來轉去的 都被搞混了....
意思factory去年原本員工組成有四分之一是建築師,然後後來加入60位新員工,
其中50位是建築師,所以後來建築師佔公司總人數的1/3
設去年的公司總人數為x, 建築師 (1/4)*x,又加入50個,現為(1/4)*x +50
then, (1/4)*x+50=(1/3)*(x+60) => x=360
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