第一張的遞迴關係式怎麼來的 第二張怎麼算 第三張的一般式怎麼來的 有誰可以幫我解答，感謝！

演練 試寫出下列數列一個可能的遞迴關係式與一般項 的通式,使得它的前四項分別下列各數: (2) Xbn) : 1*2.2*3.3*4.445 , ... 解: V d = 1 (1) (an):1,4.7, 10, 6,= / 19:51 -an-angt3 +3 Au= /+3 (0-1) 3N-2 NEN ( 12) L - - {{{+} }-(1-1){ (1-1)+1] zn (122) b,= 2 lo bn-bn-1 + 22 (122) bu-nanti) NEN

求解（幾何平均數） 這題我用公式算～但答案會有根號 讓我很困惑

求救！

PP 6. 令G為AO4的重心,已知O(C0,0): 4(6, 0),有為6,3),且了在 O8 邊上。若 4G 痘 的最小 值為咆 2 最大值為 2, 則 三 (9 丘 。

感恩！

Dofe: / / 6A42c'中, 畫 2分別在大與再邊上, 連接大、亞交於號 若太 :噴=-2:11, 4 De 求數對(Gz,訪= (9 。( 大) ! 六

求解～ 這題我用文氏圖但還是算不太出來 求解法😅😅😅😅

OHE0人中 "A^B、c三科抽考。 A及格者有有41人、B及格者有- 39人。C及格者有有和2人 , A、B不及烙者有14人,B、c不及格才 有13人。A、C不及格者有11人,至少有一科不及格者29人 : 求:(a)三科均不及格人數。 (b)至少有二科不及格之人數。 (o)只是A或B或C單科不及格者,各多少人?

求解～算很久都算不出來

司人人 了R評 In作 四 M 罷與x軸相切於P(3,0), 此 與直線L : 4x-3y+12-0想切、試未 噴之方程式。 語NOTIUAIXSEEE ES 9 貼多防

求

五、綜合測驗:10% When we think of sleepi Jaying our heads ori big ftuffy pillows and lying under niee warm bl ,SjJeep in very different places. Sea otters, for instan' 2. don't drown. When giraffes get their forty Winks, tbey are water and _2. use fheir hips as a pillow. And some creatures, like the Alpine swWift, can even doze 0 | while in 各ght! These every year On these extremely 1ong 和ights, they stay in the Sky _5 , We prob: migratory birds trayel thousand ably picture a nice comtortable bed. We imagine ankets. Most antmals, ce, sleep on their backs in the | 蟬 人G | js of kilometers between continents Weeks and even months at a time. One Swiss study in 2013 showed that Alpine sSWitts remain in the air for even 1onger than we imagined. Special sensors w be measured at all timmes. The research team found that tte Jocafion and speed _6. swifts could cover up to 10,000 km and go as long as 200 days 和hatAlpine swWifts don't sleep atall during these flights Tecently. 9. Some 8 many ag nakes fhem some Of the coolest sleepers Juffier一piows Or clouds? ( ) 1L.(A) therefore ( ) 2.(A) otherwise )訪3(0a9l ) 4.(A)amazZe ) 5.(A) Within 0 must ree that they are capable oF getting 所 least some Shut- ere_ attached to SiX birds so that their Vanding! eye up in the Sky. This 10._. It also makes you Wonder which 3 (B) however (0C) fortunately (D) miraculousiy (B) thus (C) theretore (D)yet (B) sure (C) about (D) goimg (B) amazes (C) amazg (D) amazew (B) during (C) for (D) on (B) might (C) should (D)wil

為什麼k<=-2

若方 \ 者Ms 程式+(&-2)x+(2-4)=0有實數角, 若k> 和人一一~ 全衝衝 (A) z>2或&<-2 (相, (38)人22或人A<~-2 (C) -2<&z<2 會 CHD -2<A<2人25 : b'-)lQC2o 區: (CL-2)-上(oa。 > kk+印- rilk2。 似上-目2。 2T7J(R-7/ 9 1元 上地 加只(人 )16. 若之+2ox+5m =0有重根,則,

可以幫我解這題嗎？各種方法都可

(Co) 一(0一2) 3. 設有一件工程,若甲、乙二人合作',則5天可完工;若甲先獨做4天 穗下的工程由乙獨做 10 天可完工。試求此工程分別由甲、乙二人獨做 則分別需要旗天才能完工? :濟

幫朋友問的微積分~ 這題要怎麼用夾擠定理的觀念來解題? (有計算過程更佳)