2008 Second Semester MATHS课程问答帖(请用英文提问)

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but what if i write like this:
a1*v1+a2*v2=w,  and v1, v2, w are all known, so could solve a1 and a2, hence could get a equation like this:
              w= ((13√2)/2)*v1-((5√2)/2)*v2
..........?

uwantsprincess

Anyone know how to do Question 1a, 1b??

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and for Q6, is it using the formula of  w=(w * v1)v1+(w * v2)v2+......+(w * vk)vk ?

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(c) hint: what does (a,a) look like, x=a, y=a => x=y, over here you got x=y=z
(d) see previous answers. should be obvious now.
.......?

still don't understand....x=y means a line through origin and form 45 degree angle with x-axis? then what about x=y=z?

duclover

In each of the following two cases, the set of vectors {v1,....,vn} forms an orthonormal
basis for the corresponding Euclidean vector space Rn.
Find an expression for the given vector w in terms of this basis.
(Do not use Gaussian elimination.)


Q:n = 2, v1 = [1/root2    1/root2]T, v2=[-1/root2   1/root2]T,   w=[9 4]T

(T means transpose)

duclover

i still donn't understand how to
State a system of linear equations that defines U
in this quextion.....

duclover

can i ask some questions from maths 208???

Let U consist of all vectors in 3-dimensional Euclidean vector space R3 each of whose entries

is the same, that is U = {f(a; b; c) : a = b = c }
State a system of linear equations that de nes U.



what's that mean???

thanks~

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3. (8 marks) Let U consist of all vectors in 3-dimensional Euclidean vector space R3 each of whose entries is the same, that is U = {(a; b; c) : a = b = c∈R}

(b) What is the dimension of U?
(c) Describe U geometrically.
(d) State a system of linear equations that defines U.

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anyone help in second semester math208 assignment?

CEOjennifer

here's a stupid question, does anyone know what is the criteria for Math102 to get A+? Is it 90 or 95 or 85???

cathyfee

303B25 just wondering can u help with math 253 thx!!

ccjj

looking for a maths108 tutor... urgently please...

please email me...

papa_ohyeah

help
how to integrate x/((1+2x)square root).dx
dont know how to type !
hope u understand

ty_srb$

how do you do math208 assg 4 q1.

also. i need a tutor for 208. any advice or any1 that can help me ma?
thx la..

tokidoki_y

question 9
f(x) = (x^2-1)/(2x^2-2x-12)
how do we find the asymptotes of the graph of f and any discontinutities??
and also what should we do to find t he relative extrema??

thanx.