[計量] 陳向東最新數學預測試題
想請問第一回的題目
因為是新手，要是有沒有注意到禮貌的地方請多包涵
8.A political poll showed that 80 percent of those polled said they
would vote for proposition P, 70 percent actually votedd for P,
and of those who did not say they would vote for P, 20 percent of those
polled voted for P.
What percent of those polled voted for P ?
(這題題義有點看不懂)
11.(圖表題)第三個選項要如何判斷
16.要怎麼判斷才會比較快算出大小(省一點時間)
(1)1/2+1/3
(2)7/8+3/20
(3)15/16+2/40
(4)12/25+12/30
(5)35/102+2/3
17. S is the sum fo the first n negative integer powers of 2.
S=2^(-1)+2^(-2)+......2^(-N)
S 1
(我是根據等比級數公式S=A/(1-R)) 算出來覺得應該是C選項
可是答案是B，是不是我哪裡算錯了呢
謝謝各位大大
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