Làm bài 14,15,16,17 giúo mik vs
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-x-2=\dfrac{5}{4}\)
\(\Leftrightarrow x=-2-\dfrac{5}{4}\)
\(\Leftrightarrow x=-\dfrac{13}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 C
2 C
3 C
3 D
5 D
6 A
7 C
8 B
9 B
10 C
11 A
12 C
13 B
14 A
15 D
16 A
17 C
18 B
19 D
20 C
![](https://rs.olm.vn/images/avt/0.png?1311)
x=9 nên x+1=10
f(9)=x^50-x^49(x+1)+x^8(x+1)-...+x^2(x+1)-x(x+1)+100
=x^50-x^50-x^49+x^49+x^48-x^48+...+x^3+x^2-x^2-x+100
=-x+100
=-9+100=91
![](https://rs.olm.vn/images/avt/0.png?1311)
while..do
Program HOC24;
var i,n: integer;
t: longint;
begin
write('Nhap N: '); readln(n);
t:=1; i:=1;
while i<=n do
begin
t:=t*i;
i:=i+1;
end;
write('T = ',t);
readln
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 regularly
2 kindly
3 kind
4 well
5 good
6 softly
7 soft
8 rapidly
9 rapid
![](https://rs.olm.vn/images/avt/0.png?1311)
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44. If you recycle, you will save natural resources
45. If I knew how to use this machine, I could help you
46. The students were excited about the journey
47. Peter who can solve this diffcult problem is the best student
48. My secretary is a fast typer