1 大於1的正整數n，給個式子(n^2-1)!/(n^2-4)![之後好像是說它們有多項式]，然後就問
the dgree of the polynomial? 選項有0 1 3 6 9(大概是，待證實)
(這題在說什麼?請解釋一下.........)
25、DS: 兩個數 大數的1/3比小數的5倍還多 問小數是不是less than 4 ?
(1)大數比50大
(2)大數比65小
(1)若大數代54,小數<4
但若代63則小數非<4..........不充分
(2)同理....不充分
(1)+(2)代63則小數非小於4......
以此題問法,答案是充分or不充分??
JJ給答案若A,B為整數-充分,選C；若為實數- 不充分,選 E。
PP:
Some waters was remove from each of 6 tanks, if the stander deviation at the
begining was 10g,what was the stander deviation at the end?
1)each tank,at the begining 30%water was remove
2)mean at the end was 63g
(看不懂解答...(1)為何要10^2 ?)
請大家幫幫忙了,快考試啦~~感謝!
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