第3題的第2小題 求算式 謝謝

(92) = (x,- p)? +(1, - p) + (x,- p) +---+(110 - p) tii 14 * $ p, u WP-- 480 +10=48 (2)這10筆一排數據(x, , , , , , L, L, L, Lab)=(30.40.40.40.50.50.50.50.60.7%)的標準差為 2017 維L Qnt) = 10 Qn4-94 324 +64x3+ 1681 4 y » 4 Bf s10.6² 6² 116. 4 x 29 3.設款到(an)滿足=5,ap=10aa +9。 (1)# 44-a=10(4,-a) Wa=_-) 6=2529 (2)求L乘開後的各位數字和為 4. 某班學生共60人,分A、B两组參加數學競試,各組人數、平均及標準差如附表: 4209 班级 人数 平均 標準差 A 20 50 10 B. 40 80 5 則全班之平均數為 TO (2)標準差為He 50x20+80x40 bo 么女 = 20 (3)

請問第（2）這個選項怎樣解？

a bc NE =1,則下列哪些選項正牌? ( )2 若行列式 2 m P 9 r >> -118 11th 1e el-hlab 十 a C q 2c p l a 2a b a -b c 9 m b = 1 (2) l 4m n = 4 3-2 m -n = 1 n C 2p 9 2r P -9 r a P b m ||| 圖 a = 1 (5 a Haba CFURY PANA rm 30 n BB |=5 p-2a 9-26 2e SP sq sr C n > 一

不好意思 請問這題該怎麼解 謝謝～

9 9 O 類題 1 如右圖街道圖,某人由A走到B,若規定可以走→、、但走過的道路不 可重複走,則由A走到B,不經過P點但不經過Q點的走法有 種, 答:60 22 PC1 e 360 2 bz 420 si B i v LOS Alabaloo libiçid, bz C3dz 4x4 x3 b3c3d3 O 3 Cads X3

求解這題為什麼沒有E⋯

3. 設兩空間向量OA與OB不平行,若P點在OA與OB决定的平行四邊形區域內部, 則P點可能滿足下列哪些選項? 0 - (C) 3OP=OA+OB C O ( "No cafe #Lao PL 3OP=27A-7B AS D) PB = LAB 1.1 2 2 OP = 30 +303 ( | 2 。 (E) AP+2PB=0 (B) 0 (B) OP = ŽA-Ž UB -3 E Hp:-278

求救第55題 完全看不懂他要我幹嘛

Year slenue Req) = 1932 1958 +1000 q R 9)=-1000q =74 1963 1968 COM If the price in dollars of a stereo system is given by 1000 p(q) + 1000, 1000 ² q where q represents the demand for the product, find the mar- ginal revenue when the demand is 10. 54. Profit Suppose that for the situation in Exercise 53 the cost in dollars of producing a stereo systems is given by C(q) = 0.2q2 + 69 + 50. Find the marginal profit when the demand is 10. 59. Marginal Product of Labor The output y of a manufacturing y process is a function of the size of the labor force n using the function 1990 +1000 1971 1974 = 990 197 197 19 19 1 y = kVn. The marginal product of labor, defined as dy/dn, measures the rate that output increases with the size of the labor force, and is a measure of labor productivity. (a) Show that (c) Using the a cubic f respond the rate and 200 (d) Discus descri part ( the y (e) Exp data calc ful x C(x) = 58. Money 1955-7 dy k dn an (b) How can you tell from your answer to part (a) that as the size of the labor force increases, the marginal product of labor gets smaller? This is a phenomenon known as the law of diminishing returns, discussed more in the next chapter. 56. Profit An analyst has found that a company's costs and rev- enues in dollars for a product are given by x2 C and R(x) 2x 2 5000' respectively, where x is the number of items produced. (a) Find the marginal cost function. (b) Find the marginal revenue function. (c) Using the fact that profit is the difference between revenue and costs, find the marginal profit function. (d) What value of x makes the marginal profit equal O? (e) Find the profit when the marginal profit is 0. (As we shall see in the next chapter, this process is used to find marimum profit.) A wher in bi find year (a) (C) (e) nad since

求第7、9、10、11題解析 🙏🙏🙏

2 = 3, Z 中 Dhe ti (logtx- log 3) (37 +3²) (98-7*) <0 ,XE - 8. AABC AB=4 . BC=5, CA = b , LA 5A DEL TEU Ep to 4封「x. }); (三子) X

不懂最後面BD^2=AD^2-AM^2

7 || (而上的“明影 、 31日(的,制的CD的 SO, B7) 9大三 ||(1) ;中女中、雄中」 ti 9 3 Ez M ADAM TEM f 4 km AD = LABTEM") + OM BD = EM ²40M² | Bb An=1 > 到后到 BD=652

想問牛刀2的（3）（4）跟牛刀3的（1）（2）

牛刀小試 2 有關空間之直線與平面,下列何者為真? (1)直線相交便平行 > (2)二平面相交便平行 (5) AB交平面E於B,在E上有一直線 BC LAB,則ABLE * EB # F#, (包含相異三點A、B、C之平面恰有一個 (5)平面E、F、G中ELF,FIG,則E || G GY 留:(2) 牛刀小試3 | 下列敘述何者為真? (1過L線上一點恰有一直線垂直於L 2過L線上一點恰有一平面垂直於L (3) 三相異平面若兩兩相交,則必交於一點或一線X (4) 三相異直線若兩兩相交必共面又 (5)過平面外一點有無線多條直線平行於此平面。 Air 解:(2) (5)

請問這題要怎麼算 謝謝

70 12 D 1B (1 6x6x3 14 24 B a= 1 (31) 7.4 36Y) G. 如右圖所示,ABCD - EFGH為一長方體。若平面 BDG 上一點P滿足 30 AP = AB+2AD + AE,則實數a 新乡 (化成最簡分數) 4 【A版範圍)15% ] 90 3 ña toto+JE SGAE = 5G-SB - so 3) H E to 5B + 50+ Lab 66 /es、n F 65 56 > ( f (VA)

求解39.40題

COS LABD = 平面 DBC所成二面角為90°,則 7+ 8 = 14 7 32-24 2x 4xY exy || 9 > ] 39.底部是邊長為8的正方形如右圖,且AB = AC = AD = AE -6,若平面ABC 與平面BCDE的夾角為6,則 cos = Is ;平面ABC 英平面 ACD的夾角為,則cosp = E C 「 1. 在空間中,一個斜面的「坡度」定義為斜面與水平面夾角的正切值 tang,若一金字塔( 底部為一正方形,四個斜面為等腰三角 形)的每一個斜面的坡度皆為,則相鄰斜面的夾角的餘弦值為。 5 口红正面语语(3.5 00), to kny正軸上一组上(00 ml。加里亚 F組 » 亚面的色成 60 应,则a= } P 一 所張成的 0713839 *w。 461 95+56 ho