\(i:=0;\ while\left(i<10\right)\ i++;\)
Sau đoạn ct, \(i\) có giá trị bao nhiêu?
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Olm chào em. Cảm ơn em đã dùng nền tảng olm cho việc học tập và giao lưu với cộng đồng tri thức. Đây không phải là toán lớp 4. Vì vậy em cần đăng đúng môn học.
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/ \(3x=k\pi\Leftrightarrow x=\frac{k\pi}{3}\)
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 |
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
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