cho (a,b)=1 tìm (a+b, a-b)
please help me :(((
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Old man: Can you please do me a favor? Ba: ...............
A. Yes. Please help me B. Sure. How can I help you?
C. Yes, you can D. No, you can't
Câu 7. The children can look after ............................... for a few days.
A. them B. they C. themself D. themselves
Câu 8. My grandfather used ____________ us to the zoo when he was alive.
A. took B. to take C. taking D. take
Câu 9. Choose the underlined word or phrase in each sentence that needs correcting.
The armchair is in the living-room among the television and the sofa.
A B C D
Câu 10. My hometown is getting more modern and .....................
A. more noisy B. noisier C. noisiest D. more noisier
Câu 11. The water wasn't ____________ in.
A. clear enough for swimming B. enough clear for swimming
C. enough clear to swim D. clear enough to swim
Câu 12. Choose the word that has the underlined part pronounces differently
A. looked B. phoned C. missed D. watched
Câu 13. Don't come in. Pleased wait ____________ for your turn.
A. outside B. inside C. downstairs D. upstairs
Câu 14. We must be there....................7.30 and 10.30.
A. between B. at C. after D. before
Câu 15. His father is very proud ________ him.
A. on B. about C. of D. with
Câu 16. They …………….. in that house for 3 years.
A. have lived B. live C. lived D. are living
Câu 17. Choose the word that has a different stress pattern from the others.
A. plentiful B. generous C. volunteer D. sociable
Vì a,b=1
nên:
_ a+b=1+1=2
_ a-b=1-1=0
Theo đề a,b là nguyên tố cùng nhau. Gọi ƯCLN của (a+b, a-b)=d
Ta có:
+ B chia hết cho d vào a-b chia hết cho d
+ Cộng vế theo vế có 2a chia hết cho d
⇒ a chia hết cho d ( hoặc 2 chia hết cho d nên d=1;2)
+ Trừ vế theo vế ta có 2a chia hết cho d
Vậy d là ước chung của a và b àm a, b là nguyên tố cùng nhau nên
UCLN (a;b) =d=1 vậy (a+b, a-b)=d=1 (a+b, a-b nguyên tố cùng nhau)
Tick hộ nha 😍