\(i:=0;\ while\left(i<10\right)\ i++;\)
Sau đoạn ct, \(i\) có giá trị bao nhiêu?
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LT
1
NV
Nguyễn Việt Lâm
Giáo viên
24 tháng 9 2020
ĐKXĐ: ...
a/ \(cotx=\frac{2}{3}\Leftrightarrow x=arccot\left(\frac{2}{3}\right)+k\pi\)
b/ \(tanx=-\frac{4}{3}\Leftrightarrow x=arctan\left(-\frac{4}{3}\right)+k\pi\)
c/ \(sinx=\frac{1}{2}\Leftrightarrow\left[{}\begin{matrix}x=\frac{\pi}{6}+k2\pi\\x=\frac{5\pi}{6}+k2\pi\end{matrix}\right.\)
d/ \(cotx=-\frac{1}{2}\Leftrightarrow x=arccot\left(-\frac{1}{2}\right)+k\pi\)
e/ \(cotx=1\Leftrightarrow x=\frac{\pi}{4}+k\pi\)
f/ \(sin\left(x+\frac{\pi}{2}\right)=1\Leftrightarrow x+\frac{\pi}{2}=\frac{\pi}{2}+k2\pi\Leftrightarrow x=k2\pi\)
g/ \(3x=k\pi\Leftrightarrow x=\frac{k\pi}{3}\)
24 tháng 3 2020
I/ Choose the best answer:
1. Choose the word which is pronounced differently from the others:
|
A. wanted |
B. worked |
C. needed |
D.visited |
2. Choose the word which has different stress from the others:
|
A. lacquerware |
B. pottery |
C. embroider |
D.layer |
3. He works as an ___________ in his uncle’s workshop.
|
A. attraction |
B. artisan |
C. embroider |
D.lacquer |
4. They need to find a solution to ___________ the local environment.
|
A. preserve |
B. cast |
C. weave |
D.knit |
5. The company is going to close ___________ one of its stores due to reduced sales.
|
A. on |
B. down |
C. in |
D.at |
6. He was hired for the position because he is ___________.
|
A. reliability |
B. reliably |
C. reliable |
D.unreliable |
7. I love going to this place _____________ it’s the quietest place in the city.
|
A. so |
B. though |
C. so that |
D.as |
8. Nothing is __________ than being stuck in a traffic jam.
|
A. worse |
B. badly |
C. more badly |
D.the worst |
9. When I __________, the town hall was already full of teenagers.
|
A. turned on |
B. turned off |
C. turned up |
D.turned into |
10. Nam: There’s a lantern festival nearby. Do you want to come with us?
Mai: Yeah, ___________ !
|
A. sorry |
B. cool |
C. I see |
D.not at all |
11. Remember to _________ your shoes when you enter a Japanese house.
|
A. take over |
B. take on |
C. take up |
D.take off |
12. The roads are ___________ as one of the solutions to deal with traffic jams.
|
A. extended |
B. expensive |
C. overcrowding |
D.shelter |
3 tháng 8 2016
a, x(x+3)=0
=>x hoặc x+3=0
=>x+3=0
=>x=0-3
=>x=-3
=>x= 0 hoặc x=-3
b, (x-2)(5-x)=0
=>x-2 hoặc 5-x=0
=>x= 0+2 hoặc x= 5-0
=>x= 2 hoặc x= 5
c, (x-1)(x2+1)=0
=>x-1 hoặc x2-1=0
=>x=1 ->(1)
x2-1=0
=>x2=1
=>x=1
Vậy x=1
VK
3 tháng 8 2016
a) x(x+3)=0
=>x=0 hoặc x+3=0
x=-3
Vậy x=0; x=-3
b)(x-2)(5-x)=0
=>x-2=0 hoặc 5-x=0
x=2 x=5
Vậy x=2; x=5
c)(x-1)(x2+1)=0
=>x-1=0 hoặc x2+1=0
x=1 x2=-1(vô lí)
Vậy x=1
