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看板GRE (GRE入學考試)作者 (peilin)時間18年前 (2008/05/06 16:19), 編輯推噓1(1推 0噓 1→)
留言2則, 1人參與, 最新討論串1/2 (看更多)
A political poll showed that 80 percent of those polled said they would vote for proposition P. Of those who said they would vote for proposition P 70 percent actually voted for P, and of those who did not say they would voted for P, 20 percent actually voted for P. What percent of those polled voted for P? (A) 56% (B) 60% (C) 64% (D) 76% (E) 90% ANS:B If x≠1 and x≠0, then( 1-1/x) / x-1 is equivalent to (A) 1/x (B) x (C) x/1-x (D) x-1 / x (E) (x-1)^/ x ANS: A -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 203.117.140.189
推
05/06 16:34, , 1F
80%*70%+20%*20%=0.56+0.04=60%
05/06 16:34, 1F
→
05/06 16:35, , 2F
1-1/x = (x-1)/x，[(x-1)/x]/(x-1) = 1/x
05/06 16:35, 2F
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