Giúp mk câu này với ạ
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1 send - will receive
2 do - will improve
3 find - will give
4 will go - has
5 will go- gets
6 doesn't phone - will leave
7 don't study - won't pass
8 rains - won't have to
9 won't be able - watch
10 can't move - isn't
11 study - will pass
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Đường tròn (C) tâm \(I\left(1;-1\right)\) bán kính \(R=4\)
Gọi \(I'\left(x';y'\right)\) là tâm \(\left(C'\right)\) \(\Rightarrow I'\) là ảnh của I qua phép vị tự nói trên đồng thời \(R'=\left|k\right|R\)
\(\left\{{}\begin{matrix}x'=1+k\left(1-1\right)=1\\y'=-1+k\left(-1+1\right)=-1\end{matrix}\right.\)
Phương trình (C'):
\(\left(x-1\right)^2+\left(y+1\right)^2=16k^2\)
Thế tọa độ M vào ta được:
\(\left(4-1\right)^2+\left(3+1\right)^2=16k^2\Rightarrow k^2=\dfrac{25}{16}\)
\(\Rightarrow k=\pm\dfrac{5}{4}\)
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23. Please take the form from your teacher and ask her to sign.
24. Can you show me the nearest way to the post office
25. We are going to plant the flowers in the parks and water them in the afternoon.
26. My brother is very good at repairing household appliances.
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\(I=\int\dfrac{2}{2+5sinxcosx}dx=\int\dfrac{2sec^2x}{2sec^2x+5tanx}dx\\ =\int\dfrac{2sec^2x}{2tan^2x+5tanx+2}dx\)
We substitute :
\(u=tanx,du=sec^2xdx\\ I=\int\dfrac{2}{2u^2+5u+2}du\\ =\int\dfrac{2}{2\left(u+\dfrac{5}{4}\right)^2-\dfrac{9}{8}}du\\ =\int\dfrac{1}{\left(u+\dfrac{5}{4}\right)^2-\dfrac{9}{16}}du\\ \)
Then,
\(t=u+\dfrac{5}{4}\\I=\int\dfrac{1}{t^2-\dfrac{9}{16}}dt\\ =\int\dfrac{\dfrac{2}{3}}{t-\dfrac{3}{4}}-\dfrac{\dfrac{2}{3}}{t+\dfrac{3}{4}}dt\)
Finally,
\(I=\dfrac{2}{3}ln\left(\left|\dfrac{t-\dfrac{3}{4}}{t+\dfrac{3}{4}}\right|\right)+C=\dfrac{2}{3}ln\left(\left|\dfrac{tanx+\dfrac{1}{2}}{tanx+2}\right|\right)+C\)
1. sociable
2. happy
3. polite
4. famous
5. crowded
6. beautiful
7. quiet
8. selfish
9. traditional
10. patient
1. sociable
2. happy
3. polite
4. famous
5. crowded
6. beautiful
7. quiet
8. selfish