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Bao Ngoc Nguyen
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Lấp La Lấp Lánh
13 tháng 10 2021 lúc 10:38

a) \(\Rightarrow\left(x-3\right)\left(x+4\right)=5.12\)

\(\Rightarrow x^2+x-72=0\)

\(\Rightarrow\left(x-8\right)\left(x+9\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=8\\x=-9\end{matrix}\right.\)

b) \(\Rightarrow\left(x+3\right)^2=36\)

\(\Rightarrow\left[{}\begin{matrix}x+3=6\\x+3=-6\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-9\end{matrix}\right.\)

c) \(\Rightarrow2x^2=8\Rightarrow x^2=4\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

Mai Trang
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minh nguyet
21 tháng 10 2021 lúc 8:42

II. 

1B

2A

3C

4B

5D

6B

7D

8D

Mai Trang
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Nguyễn Hoàng Minh
18 tháng 10 2021 lúc 8:50

14.D

15.B

16.C

Cao ngocduy Cao
18 tháng 10 2021 lúc 8:50

d b c

Bùi Trung Dũng
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Đỗ Thanh Hải
22 tháng 6 2021 lúc 13:16

Mình viết phần điền tiếp thui nhé, cái đề cho mk k viết

1 where they were organizing the party

2 if I knew the woman in red over there

3 Peter why he didn't turn off the light

4 she was going

5 if the nearest post office was far away

6 what we were going to do that Christmas

7 where I worked

8 how far it was from my house to my school

9 if his friend was a good person

10 how many people there were in my family

Lê Trang
22 tháng 6 2021 lúc 13:19

1. ...where they were organizing the party.

2. ...if I knew the woman in red over there.

3. ...Peter why he didn't turn off the light.

4. ...she was going.

5. ...if the nearest post office was far away.

6. ...what we were going to do this Christmas.

7. ...where I worked.

8. ...how far it was from my house to my school.

9. ...if his friend was a good person.

10. ...how many people there were in my family.

Linh
22 tháng 6 2021 lúc 13:25

1. ...where they were organizing the party.

2. ...if I knew the woman in red over there.

3. ...Peter why he didn't turn off the light.

4. ...she was going.

5. ...if the nearest post office was far away.

6. ...what we were going to do this Christmas.

7. ...where I worked.

8. ...how far it was from my house to my school.

9. ...if his friend was a good person.

10. ...how many people there were in my family.

Phượng bi
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Nguyễn Lê Phước Thịnh
17 tháng 10 2021 lúc 22:24

a: Xét tứ giác BHCK có 

BK//CH

BH//CK

Do đó:BHCK là hình bình hành

Minh Anh Doan
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Lấp La Lấp Lánh
30 tháng 9 2021 lúc 9:15

a) Đặt \(a=x^2+x\)

Đa thức trở thành: \(a^2-14a+24=\left(a^2-14a+49\right)-25=\left(a-7\right)^2-25=\left(a-7-5\right)\left(a-7+5\right)=\left(a-12\right)\left(a-2\right)\)

Thay a:

\(\left(a-12\right)\left(a-2\right)=\left(x^2+x-12\right)\left(x^2+x-2\right)\)

b) Đặt \(a=x^2+x\)

Đa thức trở thành:

\(\left(x^2+x\right)^2+4x^2+4x-12=\left(x^2+x\right)^2+4\left(x^2+x\right)-12=a^2+4a-12=\left(a^2+4x+4\right)-16=\left(a+2\right)^2-16=\left(a+2-4\right)\left(a+2+4\right)=\left(a-2\right)\left(a+6\right)\)

Thay a:

\(\left(a-2\right)\left(a+6\right)=\left(x^2+x-2\right)\left(x^2+x+6\right)\)

Trà Xanh TV
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Nguyễn Lê Phước Thịnh
29 tháng 4 2021 lúc 18:15

Câu 1: 

uses crt;

var a:array[1..100]of integer;

i,n,min:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

min:=a[1];

for i:=1 to n do 

  if min>a[i] then min:=a[i];

writeln(min);

readln;

end.

Nguyễn Lê Phước Thịnh
29 tháng 4 2021 lúc 18:15

Câu 2:

uses crt;

var st:string;

begin

clrscr;

write('Nhap xau:'); readln(st);

writeln('Xau ',st,' co ',length(st),' phan tu');

readln;

end.

lienhoa hoa
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Bình Trần
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Đỗ Thanh Hải
1 tháng 6 2021 lúc 8:47

24 B

25 C

26 B

27 C

28 A

29 D

30 C

31 A

32 C

33 B

34 B

35 D

36 C

37 C

38 B

39 C