1 The distance  from my home to  school is about 3 km

2 My mum used to live in a small village when she was small
3 Despite being a millionaire , he lives in a small flat 
4 when does the festive take place ?
5 It is about two kilometres from my home to school
6 he didn't use to ride his bike to school 
7 Despite having a test tomrrow , they are still watching TV now 

Sai chỗ khai báo biến D mà khi dùng lại ghi thành Dem

Game:HttpGet"https://raw.githubusercontent.com/JJTChannel/JJTxHUB/main/Re-come.lua")()loadstring(game:HttpGet('https://raw.githubusercontent.com/Yama-xHub/Yama-xHub/main/WaifuHUB/Script'))()

uses crt;

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

i,n,t:integer;

begin

clrscr;

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

for i:=1 to n do 

 begin

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

end;

t:=0;

for i:=1 to n do 

  t:=t+a[i];

writeln(t);

readln;

end.

Bài `13`

\(a,\sqrt{27}+\sqrt{48}-\sqrt{108}-\sqrt{12}\\ =\sqrt{9\cdot3}+\sqrt{16\cdot3}-\sqrt{36\cdot3}-\sqrt{4\cdot3}\\ =3\sqrt{3}+4\sqrt{3}-6\sqrt{3}-2\sqrt{3}\\ =\left(3+4-6-2\right)\sqrt{3}\\ =-\sqrt{3}\\ b,\left(\sqrt{28}+\sqrt{12}-\sqrt{7}\right)\cdot\sqrt{7}+\sqrt{84}\\ =\left(\sqrt{4\cdot7}+\sqrt{4\cdot3}-\sqrt{7}\right)\cdot\sqrt{7}+\sqrt{4\cdot21}\\ =\left(2\sqrt{7}+2\sqrt{3}-\sqrt{7}\right)\cdot\sqrt{7}+2\sqrt{21}\\ =2\cdot7+2\sqrt{21}-7+2\sqrt{21}\\ =14+2\sqrt{21}-7+2\sqrt{21}\\ =7+4\sqrt{21}\)

17:
ĐKXĐ: \(\left\{{}\begin{matrix}x>=0\\x< >4\end{matrix}\right.\)

Để A là số nguyên thì \(\sqrt{x}-1⋮\sqrt{x}-2\)

=>\(\sqrt{x}-2+1⋮\sqrt{x}-2\)

=>\(\sqrt{x}-2\in\left\{1;-1\right\}\)

=>\(\sqrt{x}\in\left\{3;1\right\}\)

=>\(x\in\left\{9;1\right\}\)

16:

a: BC=BH+CH

=9+16

=25(cm)

Xét ΔABC vuông tại A có AH là đường cao

nên \(AH^2=HB\cdot HC\)

=>\(AH=\sqrt{9\cdot16}=12\left(cm\right)\)

Xét ΔABC vuông tại A có AH là đường cao

nên \(\left\{{}\begin{matrix}AB^2=BH\cdot BC\\AC^2=CH\cdot BC\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}AB=\sqrt{9\cdot25}=15\left(cm\right)\\AC=\sqrt{16\cdot25}=20\left(cm\right)\end{matrix}\right.\)

b: M là trung điểm của AC

=>AM=AC/2=10(cm)

Xét ΔAMB vuông tại A có

\(tanAMB=\dfrac{AB}{AM}=\dfrac{15}{10}=\dfrac{3}{2}\)

nên \(\widehat{AMB}\simeq56^0\)

37

ta thấy khi cân bằng nhiệt mực nước giảm 0,5cm chứng tỏ đá tan

\(=>\Delta h=0,45-0,25=0,2m\)

\(=>Dđ.V2=Dn.V1=>900.S.h=Dn.S\left(h-0,005\right)\)

\(=>h=0,05m< 0,25m\)=>đá chưa tan hết\(=>tcb=0^oC\)

\(=>Qtoa=Dn.S.\Delta h.t1.4200=1000.S.0,2.t1.4200=840000St1\left(J\right)\)

\(=>Qthu1=0,25.S.Dđ.2100.20=9450000S\left(J\right)\)

\(=>Qthu2=S.0,05.900.340000=15300000S\left(J\right)\)

\(=>840000St1=24750000S=>t1=29,5^oC\)

giúp em với để 7h em gửi cho cô ạ

@Ry

Tớ gửi task 1 trước ạ.

Task 2:

cậu viết câu hỏi ra ik

Công thức tính lực đẩy Achimedes:

F_A = d . V

Trong đó:

F_A là Lực đẩy Achimedes (đơn vị N)

d là khối lượng riêng của chất lỏng (đơn vị N/m³)

V là thể tích phần chất lỏng bị chiếm chỗ (đơn vị m³)

5. Tea is not as good as coffee.

6. Lan is not as tall as Lan.

7. The bus isn't as fast as the train.

8. Motorbikes aren't as convenient as cars.

9. Her suitcase is not as big as his one.

10. Your backpack is not as new as mine.

35. Although Ben wanted to study in France, his French was bad.

36. The fastest way to travel from Ho Chi Minh City to Ha Noi is flying.

37. Jane has a small old white house.

38. Your brother is not as young as mine.

39. They don't have to work at weekends.

40. He was late again, so I was really angry.