幫解(a)(b)(c)(d)

1. A periodic signal x[n] is shown below. x(n] th 0 2 11 4 5 8 It's Fourier series representation is as follows: x[n] avejkuyn k=<N> (a) Determine the fundamental period N of the periodic signal x[n]. (b) Determine the fundamental frequency wo. (c) Plot the real part of ejern (denoted by Re{ejun}). (hint: eje = cose + jsin) , Refeiwn} →n (d) Plot Re{ej2wyn} • Referawang →n 3 5 2

那邊是加還是減

PLOT 【基礎題型)正射影(1) 在b 的正射影: a. b 12 b (2) a 在b的正射影展 (2)A點在直線BC上的投影點坐標 [第1题] 平面上三點 A(7,7), B(-3, 2), C(0, 6),試求: (1) BA在BC 上的正射影(68)及正射影長 | BA = (10,3) Be=(3,4) . Lu BA - BE (59² BC ec (10,5) (3,4) 13,4) To Toy (C) [ba () (3,4) =(6,8) = [ Tr. Fu 二 o(6,-4),C(-1,5),則AB 在 AC 上的正射影為

求這兩題詳解～😢😢

- ons is nilot od plass lo gorol arai (s) 29vom Sion los = 9 ) A 170 kg crate hangs from the end of affope of length L = 12.0 m. You push 人 horizontally on the crate with a varying force É to move it distance d = 3.50 m to L the side (Fig. 7-20). (a) What is the mag- nitude of † when the crate is in this final position? During the crate's displace-lid 250 bisw ment, what are (b) the total work done 32 on it, (c) the work done by the grav- 16 Hoold itational force on the crate, and (d) the kd work done by the pull on the crate from the rope? (e) Knowing that the crate is Figure 7-20 Problem 9. motionless before and after its displace- ment, use the answers to (b), (c), and (d) to find the work force + does on the crate. (f) Why is the work of your force not . ( equal to the product of the horizontal displacement and the answer to (a)? - -- your

求解1. b

B 3 Investigation 1 When a curve is increasing, we say that it has a positive gradient, and when it is decreasing we say that it has a negative gradient. Consider the curve y=xº shown in the diagram. 1 a Give the range of x values for which the gradient of the curve is i negative I ii positive iii equal to zero. b At which point is the gradient of the curve greater. A or B? The tangent to a curve at a point is the straight line that just touches but does not cross the curve at that point. N 1 y=p 1 2. 3 2 2 a On your GDC or other software, plot the curve y=x' and draw the tangent at the point (1, 1), as shown in the second diagram. b Zoom in to the point (1, 1). Factual What do you notice about the gradient of the tangent and the gradient of the curve at the point of contact? c Use your GDC or online software to draw tangents to y=x' at the points listed below and in each case write down the gradient of the tangent. 0 -1 1 2 X -1 0 2 2. 3 Gradient of tangent at x 2 d Conjecture a function for the gradient of y = x2 at the point on the curve with coordinates (x,x).

求解第九題D stroke的意思 我查到的是有舉動的意思 為什麼不能選

PA (A) popularity (B) similarities (C) challenges (D) injuries 7. Most of the lavatories on the plane are -toilet Why don't you go un D (A) occupied (B) smelly (C) stuck (D) vacant a Pepe 18. The mass plays an important role in shaping public opinions. (A) transportation (B) media (C) murders (D) scale fatto There are too many characters in the novel and its complicated confused me very much. (AXcover (B notes (C) plot "D) strokes 10. Greece and Egypt well-known for their rich cultures, jis where the ancient c D originated

想問紅框的最後一句話，violating sanction against Iran.是什麼意思 violating是違反違背的意思，sanction是認可支持的意思，against又有反對的意思，那整句話到底是什麼意思，怎麼又支持又反對的？ （文章是BBC新聞）

SIMÈ 下午4:01 < Annotate o scarea Oiner, Onerwise, they would not send anyone here to kidnap me." US authorities said the kidnappers were aided by a fifth defendant, California resident Niloufar Bahadorifar, who was arrested on 1 July. She is not accused herself of participating directly in the plot, but is charged with providing financial aid to the conspirators and violating sanctions against Iran. Ms Bahadorifar has pleaded not guilty and been released on bail, authorities said. The justice department also said the defendants are charged with fraud, money laundering and sanctions violations. "As alleaed, four of the defendants OD

求高手幫忙

1(35%) Determine the Fourier series representation of the periodic signal x(t) shown in Fig. 1. Plot its frequency spectrum Ck/ versus frequency 0, 020, where Ck is the Fourier series coefficient. xt (0) 20 -6 -4 -2 0 2 士 4 16 10 十-20 Fig. 1

clc opengl('software') load HW9_Data x = data(:, 1); y = data(:, 2); y=y+0.01*randn(size(y)); % Artificial noise tic%開始計時 % --- %... 繼續閱讀

這題可以這樣寫嗎？ 中間中括號可省略？

||| 21. (1)已知、3為無理數,a、b為有理數,若a+b^3 = 0,求證:a=0且 Toato, bto bJ3 EQ' aEQ granted and to ( m movis Hollisbio bazeld todo blod ( a+b53 EQ! (A) ovat wy dost 【 [to , = ato, b=0 sto nova ni od uoy lliw dow2l2toni diiw oqello () 21) a + 0 = 0 (5) obola In a=0. bto 21 653-0 (25) ] liflor wollbro bosc o comam TV ovog to afo. bto igitoda a porta de su 1619 olio olio suolo Commt voi of sidizoom insmori vilo do 0 0 olo ool VT 3 Toma or plot of wortion El 15 dmoon be az JOV s browol bolas bre 2 Tidad loglod sodom sviton vloer og

急~ 不知道訂正的正不正確 請幫我看看 謝謝

aese opbjecfs find almosf 7 ivers/ / 入eserett “sense”the scents ofthings. im gto 了e text, why did Shakespeare mention rosemary in his work? (4%) 几 讓 人 planted 過 acharacter in the play as part of the plot. Vcl He 襄尖 Toduce the various DU from the British gardens.- Ve known the connection between scents and memory. (D He wanted to highlight the superior sense of smell in women. 和e立 36. Ifyour friend feels a lot of pressure from schoolwork, according to the are 5 picture, which_scents would you 訖zz Poyerder:t/ REES to her? (4%) ce cosves ozz 7zzz7aZ 7epsyoz7ezgx 點 、 Woo外 for 2 人 PC 27 2 了ez guyey yo elergy, 7 2 Zoyzezy oz7*/7eyy 7gAey oz /ess Zerozy