請問第（2）怎麼解？

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

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

請問為什麼類題平面E的法向量不用平行（-12,17,-4） 還有過點（2,1,-1）是怎麼來的？

9 列6) 過點垂直平面 N. 設平面E過點(1,1,1),且垂直於E: 3x+y-z-1=0 與E.: 4x-2y-z-5=0,則平面E 的方程式為 元为E的先后。 - (7-1)+(y-1) fro(3-1)。 32+ y + 10Z = 14 元 (2,1, 1) 元(+,-2,-1) : ELE, A ELE 元旦 元, 方与取元1元 TIT. - () =(-3,-1,-10)||(3,1.10) Inixna n. =L - 二 Na 試求過A(2,1,-1),B(1,1,2)且與平面E:7x+4y=4z=3 垂直的平面E方程式為 0 3 E, it a ni= 17, 4,-4) AB=(-1,0.3) TIXAS : (13 *).7-2.9D = ( 12,-1.4)/(-12, 11.-4) -12(x+1)+ 114-412-3)=0 -12x+ My - 47 =0 12x+10y +4730 D

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

請問第二題，這樣算為何錯呢？ （答案為-1/2，2）

(3) | z-a|+|c-b|=|a 21,0u DUNLU 备。 範例引導 10 《絕對值不等式》 《方公認会) 1. 試求不等式312x-5|<9的解。 2. a,b為實數,若不等式|ac + 1 |<b的解為-2<x<6,則數(a,b)=1。王宗土 AM TAE AERIS:=002_DS () 32 x (1) 4 = x 2-3 € 9 as 1 -32x-5 | 12X A = -2 15- 24.12. J-1 2. 2 << <|| < 并 asfa ] (2) -bLaxtlab axtleb axta-b bet a 一 b- b- 1 x shah < 29=-b-l -- bate 6 69 = b-/ -- 492-2 a 2 b = -2 類題演練

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

求解這題🆘🆘空間概念 習作基本題⋯第三題的第三小題 Cos 那個算不出來 答案是7分之根號21 究竟錯在哪🅿️🅿️🅿️

4. - B 3E 4.右圖是一個四面體,且為頂點D在底面ABC的投影點,E為 BC 的中點。已知AB = BC = CA=6, DA=DB = DC=4,且底面ABC 與側面 BCD所形成的二面角為日。 (1)求DH的長度。 (2)說明:ZDEA=0。 (3)求cose的值。 3 (1) LAB(正三角 (2) DE 5C PE , AD BCA DE CABLE 准考高 E DE LBC TE = J6²3² = 127-33 同时) | HE IPC ) HE = 3 區的一面, PHIX LDEAU 《三) DE L'BE 6 - (Tb} (05: DE = 14² -32=55 2、(E)、EA) ODEH, DH 115-12-14 5+27-16 16 25 2/135 135 (3) los 2.15.12 11 3015

請問這題我這樣寫對嗎 要怎麼繼續寫下去 謝謝(ฅ´ω`ฅ)

精選範例 72 設4,B是三位的正整数 (答案由小到大排列) 【答案】:180 或190 ,且300<B<400,若logB的尾數是1024的2倍,則A= 多 2+1 og 3 < lugB L2 + log + /+ LAB 3.444 24 34 A 5 log 3 < log A L 24 log 2 2+ / 0.3010 2 + 0.1505 - logA12 12 2 + 0.3010 o. 1505 lo0 L A L 200