#include <bits/stdc++.h>

using namespace std;

long long i;

int main()

{

for (i=20; i>=15; i--) cout<<i<<" ";

return 0;

}

g) \(\left\{{}\begin{matrix}x-1\ge0\\2-\sqrt{x-1}\ge0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\\sqrt{x-1}\le2\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x\ge1\\-4\le x-1\le4\end{matrix}\right.\)

\(\Leftrightarrow1\le x\le5\)

h) \(\left\{{}\begin{matrix}\dfrac{2x-4}{5-x}\ge0\\5-x\ne0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}\left\{{}\begin{matrix}2x-4\ge0\\5-x>0\end{matrix}\right.\\\left\{{}\begin{matrix}2x-4\le0\\5-x< 0\end{matrix}\right.\end{matrix}\right.\\x\ne5\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}5>x\ge2\left(tm\right)\\5< x\le2\left(vl\right)\end{matrix}\right.\\x\ne5\end{matrix}\right.\)

\(\Leftrightarrow5>x\ge2\)

i) \(x^2-8x-9\ge0\)\(\Leftrightarrow\left(x-4\right)^2-25\ge0\Leftrightarrow\left(x-4\right)^2\ge25\)

\(\Leftrightarrow-5\ge x-4\ge5\)\(\Leftrightarrow-1\ge x\ge9\)

j) \(2x-x^2>0\)

\(\Leftrightarrow\left(x-1\right)^2< 1\)

\(\Leftrightarrow-1< x-1< 1\Leftrightarrow0< x< 2\)

a: ĐKXĐ: \(2\le x\le4\)

b: ĐKXĐ: x>0

c: ĐKXĐ: \(x< \dfrac{1}{3}\)

g: ĐKXĐ: \(1\le x\le4\)

h: ĐKXĐ: \(2\le x< 5\)

i: ĐKXĐ: \(\left[{}\begin{matrix}x\ge9\\x\le-1\end{matrix}\right.\)

\(0< x< 2\)

= -2³/3 + 2²/2 + 2.2 - [-(-1)³/3 + (-1)²/2 + 2.(-1)]

= -8/3 + 2 + 4 - 1/3 - 1/2 + 2

= 8 - 3 - 1/2

= 9/2

\(\int\limits^2_{-1}\left(-x^2+x+2\right)dx=\left(-\dfrac{x^3}{3}+\dfrac{x^2}{2}+2x\right)|^2_{-1}=\dfrac{9}{2}\)

36. voluntarily

37.industrial

38. breathless

39. .intentionally

40.breakdown

41. pleasantly

42. preference

43. economical

44. ko biết :v

45. misunderstanding

1.has
2.has
3.has
4.are
5.is
6.is
7.Does she have...
8.has
9....is John having....
10.Does Mai have...
11.has
12.has
13.are
14.Is it...( câu này đề mình không đọc rõ lắm)
15.is
This is my opinions

Theo mình:

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