Số lớn nhất là 172, số nhỏ nhất là 159

R = 172 - 159 = 13

C38: C

C39: A

C40:D 

c a d nha

Câu38:                             Câu39: A                    Câu40:D 

Áp dụng công thức tính dãy số ta có :

\(164+165+...+1000=\frac{\left[\left(1000-164\right):1+1\right].\left(1000+164\right)}{2}=\frac{837.1164}{2}=487134\)

\(164+165+166+...+1000\)

\(=\frac{\left(\left\{1000+164\right\}.\left[1000-164\right]:1+1\right)}{2}\)

\(=\frac{974268}{2}=487134\)

164+165+166+167+168+...+1000 

=[(164+1000)x(1000-164):1+1]:2

=[1164x836]:2

=973104:2

=486552

164. It’s a six–hour drive from London to Edinburgh.
 It takes ________six hours to drive from London to Edinburgh.____________________________________
165. It’s ages since Alan visited his parents.
 Alan _______hasn't visited his parents for ages__________________________________________________
166. Mr. Will lost his job because he was late every day.
 If _______Mr. Will hadn't been late every day,he wouldn't have lost his job_________________________________________
167. The police made the youth empty his pocket.
 The youth _______was made empty his pocket._______________________________________________
168. Lawrence hasn’t seen his sister since she left for Japan.
 Lawrence last ______saw his sister when she left for Japan.___________________________________________
169. John is fat because he eats so many chips.
 If ________John didn't eat so many chips,he wouldn't be fat______________________________________________
170. If Joe doesn’t change his way, he will end up in prison.
 Unless ________________Joe changes his way, he will end up in prison.___________________________________
171. Having a vacation abroad is interesting.
 It’s _________interesting to have a vacation abroad___________________________________________
172. The water was so cold that the children could not take a swim.
 The water wasn’t _______warm enough for the children to take a swim. _______________________________________
173. It’s two months since I last spoke to her.
 I haven’t _________spoken to her for two months__________

120=2³x3x5             170=2x5x17

130=2x5x13             168=2³x3x7

165= 3x5x11             232=2³x29

`@120=2.2.2.3.5 = 2^3 x3x5`             

`@170=2.5.17` 

`@130=2.5.13`             

`@168=2.2.2.3.7 = 2^3 . 3.7`

`@165= 3.5.11`             

`@232=2.2.2.29 = 2^3 . 29`

a)

b) Số đo chiều cao của bốn vận động viên Thắng, Hùng, Bình, Trung theo thứ tự từ thấp đến cao: 175; 178; 180; 182.

c) Vận động viên Lợi thấp hơn vận động viên Hùng

    Vận động viên Dũng cao hơn vận động viên Bình

a)

b) 175, 180, 182

c) Vận động viên Lợi thấp hơn vận động viên Hùng.

Vận động viên Dũng cao hơn vận động viên Bình.

Chiều cao trung bình của đội bóng:

(164 + 165 + 167 + 170 + 171 + 169) : 6 ≈ 167,7 (cm)