為什麼這時積分變數t變換為τ時，積分範圍不會改變呢

例題1-7: Given a function f(t) and its Laplace transform F(s), what is the Laplace transform of the delayed version of f(t) by 2>0 units of time, i.e., f(t−2)? You must give a +b(1) proof of your answer. 解 根據拉氏轉換的定義,F(s)=L[f(t)]=ff(t)e="d,所以 【85 中興電機】 [ƒ (1-2)] = f(t−2) e™ dt = f(t-2)e(-) d(-2) -2s 【大專告 201 0 0 C-TER -λs (a)D -ST =eft-)e-d(1-2) = e | f(t)e dt = eF(s) 0

想問這題怎麼算

28. A trough is 6 m long and its ends have the shape of isos- celes triangles that are 1 m across at the top and have a height of 50 cm. If the trough is being filled with water at a rate of 1.2 m³/min, how fast is the water level rising when the water is 30 centimeters deep? goal: dh dt

這題怎麼寫，算了很多答案都不是2 （老師給的答案是2）

-0.50 Price (dollars per popsicle) 0.30 0 15 25 5) The figure shows the demand curve for popsicles. The arc price elasticity of demand when the price of a popsicle increases from $0.30 to $0.50 is A) 0. D B) 1. C) 1/2. D) 2. Quantity (popsicles per day)

救救我要怎麼求證 大大感謝

1. it is · (f(x)g(n))²= f'(x)g(n) + fox gix fix) 2. uit 1 3 VEDA (for) ]' f'(x) g(x)-fix) g(x) g(x) g(x)

請問這個怎麼證明🙏🏻 謝謝

1.試證: lin 000 sino D = 2. { [sin(x)] = cos(x) : Hirt & Aist

想問一下這題要怎麼算🙇‍♀️

A model is based on an assumption that an additional year of education increases a student's future wage by 20 percent. 4) Refer to the scenario above. The hypothesis of the model is that 4) A) college graduates will earn about 80 percent more than high school graduates B) college graduates will earn about 107 percent more than high school graduates C) college graduates will earn about 200 percent more than high school graduates D) college graduates will earn about 275 percent more than high school graduates

看不懂老師的算式 有人能幫我拆解步驟解釋一下嗎 或是另外寫易懂的算式過程 拜偷

A sample containing 25.14g of neutral salts, glucose and a sodium carbonate/bicarbonate buffer was dissolved in 100 ml of water. A 25 ml aliquot of the resultant solution required 20.35 ml of 0.0987 M HCl when titrated to the PP end-point. A second 25 ml aliquot was titrated to the MO end-point and required 56.75 ml of the acid. Calculate the percentage of Na2CO3 (molecular weight 106) and NaHCO3 (molecular weight 84) in the sample. 含有25.14克中性鹽、葡萄糖和碳酸鈉/碳酸氫鈉的樣品將緩衝液溶解在100ml水中。需要25毫升等份所得溶液滴定至PP終點 時,使用20.35ml 0.0987 M HCl。第二份25毫升等分樣本是滴定至MO終點,需要56.75ml酸。計算百分比樣品中的Na2C03 (分子量106)和NaHCO3(分子量84) 39

想請問這題的9～11的環烴的condensed structure可以怎麼畫？ 謝謝🙏

57. a. What is each compound's systematic name? b. Draw a skeletal structure for each condensed structure given and draw a condensed structure for each skeletal structure. h HHHHH3)2 D BH, NH√H₂0; Josaphat Br CH3 OH Orkstgo 7. CHHOCH23 9. OH 11. Br 4. (CH3CH2)+C ok 8. CHOCH2CH2CH₂OCH x146 11-trimethylheptane 25-bromo-2-methyloctane Q = --是否可省了 5. 5-bromo-N-ethylpentangmine 6. 2,3,5-trimethyl hexane 這題想請問 1. 3.的-1-是否可以省略?-1-在哪種情形下可以省略? 2. 環烴的condensed structure該如何畫?

想請問這題的醚和胺的沸點可以如何排序？ 因為我印象中氫鍵的影響比極性大，因此不了解為什麼胺的沸點比醚小 謝謝🙏

56. List the following compounds from highest boiling to lowest boiling: NH₂ 分子量 - * b₁p= HB dipole 為何 ↓ relatively weak HB OH ⑥ dipole-dipole interactions Q= LOH has two groups that hydrop bund ~HNY WH HB的影響力不是通常大於極性嗎? OH Obme electronegative thun N, OH Ingen bond are stomper than NH₂ primary amines form stronger hydrogen bond than seculary relatively weak no bydrogen had hydrogen bonds HB→分子量(分散戶 nly dipic dipole →接觸面積→極性 hah no hydrogen bon weaker dipole-dipole interactions tha oxygen-containing compounds because N is low electro negative than O

不知道怎麼畫 教教我吧 謝謝🙏

8. Sketch the graph of a function y = f(x) that satisfies the following con- ver: ditions: f(0) = 0, lim f(x) = 0, lim f(x) = lim f(x) = ∞ xx x-1- x-1+ lim f(x) = lim f(x) = =-〇〇 x-1+ x-1-