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

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)

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

請問此題

7. AABC AB=6 BC=4 AC=5, 240P LEAABC PSBELE AP. AB=17 P.AC-15。若AP-LAB+y AC,其中x,y皆為實數,則數(x,)= RA Ã 90

求解 感恩qq

(AXA 最近數學家發現一種新的可以無縫密铺平面的凸五邊形ABCDE,其示意圖如右。關於這五邊形, 請選出正確的選項。 (A) AD=202 B) /DAB = 45 (C) BD = 2.6 (D) LABD = 45° D 2. 4 E 9009 (E) ABCD的面積為2.2。 2 1039 B √6 + √2 2

（三角函數） 請問這題的選項5⃣️為什麼ABC為正三角形時，面積會最大呢

19 XJ A 15 A= s=24543 _ is =IStr 59 Pletzt Z 4 15x5x9 3432² 2x5x3 C bo B (4) 12 已知四邊形ABCD 為圓內接四邊形,如右圖,其中40=7, (12) AD=5, CD=3,請問下列哪些選項是正確的?對角互補 · 的 (詳解) 77573 (以AACD 面積為 z = 2 |) 1513 (>=。 OS LAPC= 12ZABC>60° ZB+ CD = 180° :LABC= 60° = 16 4 4. 5 : 一: ¥2) 5 sin ZACD=3 sin ZDBC STULACD 7 SincoBC -351N LACD=551MLOBE .. LADC= 120° 《四邊形ABCD 的外接圓面積為 n 14 2 J3 =2R, R = J3 四邊形ABCD 面積的最大值為16/3 49 當AABELA時,有1404x4 直! '一 二 49 JT 2 Sin LAB C = 2R =) 3 33 Z 宿世 图

（三角函數） 請問選項5⃣️要怎麼看？ 看不太懂詳解給的那個圖形是怎麼得到的

PI 5 B0 (14)2、下列哪些選項的條件可以决定唯一的AABC? AB=5 · BC=2,5 · ZA=30° Ec=5sin30°=2,5 A C 9 (12) MOLAB=4 , BC=2.5, ZA=28° 9 (3) (2) B B sina (3) sin A : sin B : sin C=1:2:3 12.5 68 C 日 | 1 12.5 (CA) sin A=sin B=-, AC=2 2 SA C 1 2 (5) sin A=- sin B=— ' AC=2 3 3 14) ° 9 8) ==. LA = LB = 30° or 150 (7) ° C N (5) 力, or B B . -> 設色、6、8、4為第一、二、三、四象限角,且0°<0.6 9

求解第4題(ಥ﹏ಥ)謝謝您

IZ 單元2 絕對值 4. 已知a、b、c為非零質數,且a+b+c=0,則回国,ge and bel Joel label a b C ab be ac abc 組可能 5.設a、b、c為整數,若a-3 +415-1+5|--|-10,則(a,b,c)有

求過程

ath zab bu zab <lab dodel atb