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\(\left(-n\right)^{2k+1}=-n\)

Thay X = -1 ,ta có: \(\left(-1\right)+\left(-1\right)^3+\left(-1\right)^5+....+\left(-1\right)^{99}\)

=\(-1-1^3-1^5-1^7-...-1^{99}\)=\(-1-1-1-1-...-1\)=\(50.\left(-1\right)\)=\(-50\)

= 13635

13x11=143.kick nha

302 : 2

14* k có số nào có thể điền vào để chia hết đc

1440 : 2,3,5,9

tíck mik nha

1.A. devotedB. suggestedC. providedD. wished

2.A. missedB. wantedC. stoppedD. washed

3.A. passedB. watchedC. playedD. washed

4.A. claimedB. warnedC. occurredD. existed

5.A. lookedB. missedC. watchedD. wanted

6.A. concernedB. receivedC. attractedD. concealed

7.A. raisedB. pickedC. laughedD. watched

8.A. booksB. clubsC. hatsD. stamps

9.A. pensB. booksC. laughsD. brackets

10.A. tripB. riverC. lifeD. city

11.A. thatB. theirC. theD. thank

12.A. ideaB. goingC. willD. trip

13.A. healthB. appearC. readyD. heavy

14.A. greatB. meatC. seatD. repeat

15.A. entranceB. paddyC. bambooD. banyan

16.A. dislikeB. designC. musicD. light

17.A. knowB. soC. goD. now

18.A. whereB. whoC. whatD. why

19.A. theB. thereC. thinkD. this

20. A. chemistryB. kitchenC. watchD. catch

III. WORD FORM

1. she is____sucessful______in her job. (SUCCESS)

2. Have you got any_______information________about the exam? (INFORM)

3. Do you know the________importance_______of English? (IMPORTANT)

4. He suggested______going________to the cinema. (GO)

5. The Internet is a wonderful ______invention________of modern life. (INVENT)

6. He watched an________exciting_______match on TV. (EXCITE)

7. ________traditionally______, Vietnamese women usually wear aodai. (TRADITION)

8. She looks so_____beautifully______(BEAUTY)

9. The price of ______electrical_______has gone up. (ELECTRIC)

10. The boss is ______kinding______ He never helps any one. (KIND)

11. Lam Truong is my____favourite_______singer. (FAVOR)

12. She is a good singer. She sings very______beautifully______(BEAUTYFUL)

13. Ha Noi is _______different________from Kualar Lumpur. (DIFFERENCE)

14. Maryan was______impressed________by the beauty of Hanoi. (IMPRESS)

Vi ab va ba deu la 2 so nguyen to

=> ab va ba la hai so le khac 5.

=> 1 < a - b < 9

Ma : ab - ba = 10a - b - 10b - a = 9a - 9b = 9 ( a - b )

Vi 9 ( a - b ) la so chinh phuong

=> a - b phai la so chinh phuong.

=> a - b = 4

=> a     = 4 + b

Vi a le khac 5

=> a > 5

=> a = 7 , 9

Neu a = 7 => b = 3 , ta co : 73 la so nguyen to

Neu a = 9 => b = 5 , ta co : 95 khong phai so nguyen to.

Vay 2 so can tim ab va ba la : 73 ; 37.

người kick là tui mà