Đáp án+Giải thích các bước giải:
x^2021 = x²
⇒ x^2021 - x^2 = 0
⇒ x² . (x^2019 -1 ) = 0
Ta có hai trường hợp
TH1
x² = 0 . Vậy x là 0 ∈ STN ( thỏa mãn )
TH2
x^2019 -1 = 0
x^2019 = 0+1
x^2019 = 1^2019
Vậy x = 1 ∈ STN ( Thỏa mãn )
X ∈ {0;1}
`x^2021=x^2`
`->x^2021-x^2=0`
`->x^2(x^2019-1)=0`
`1) x^2=0->x=0`
`2) x^2019-1=0->x^2019=1->x=1`
Vậy `x=0` ; `x=1`
Giúp mik với Có thể vẽ hình hoặc không, ko bắt buộc
giải hộ em với ạ. Tối em phải nộp bài
C=6-x -√x / √x +3 a) Tìm ĐKXĐ C b) Rút gọn C
viết cho mik chữ:'cảm thụ văn học' bằng bút máy hoặc bút chì phải có nết thanh và đậm phải đúng ko sao chép nếu sao chép mik bc và sẽ bị xoa sđấy nhé
Giúp em với ạ, chỉ kĩ xíu giúp em với
các bạn làm bài văn này cho mình càng nhanh càng tốt nha
Các bạn ơi giúp mình vs mình cần gấp(có lí do chọn nha)
Q29: Rewrite the sentences using the words in brackets, without changing the meaning: Nam started studying in this school 3 years ago. * Nam has studied in this school for 3 years. Nam has started studying in this school for 3 years. Nam has started to study in this school for 3 years. Nam studied in this school 3 years ago. Q30: Write questions to the CAPITAL words: I often have English lessons ON MONDAYS. * What time do you often have English lessons? When do you often have English lessons? When often do you have English lessons? When you often have English lessons? Nhanh ko cần giải thích
1. Find out the mistake in each sentence: The football match last Sunday was very excited. A. excited B. was C. The D. match 2. Choose the best answers: An island is covered by …………….. water. A. a lot B. much C. lots D. many 3. Choose the best answers: Bus is the main vehicle of public________in Viet Nam. A. travel B. movement C. transport D. tricycle 4. Odd one out: A. helicopter B. flying car C. plane D. underground 5. Choose the correct sentence that has the same meaning as the first one: I usually spend two hours doing my homework every evening. A. I usually use two hours doing my homework every evening. B. It usually takes me two hours doing my homework every evening. C. It usually takes me two hours to do my homework every evening. D. I usually use two hours do my homework every evening. 6. Choose the best answers: Many cultural activities ………………… every year. A. are hold B. hold C. held D. are held 7. Find out the mistake in each sentence: Nick wash his hands a lot, so he doesn’t have flu. A. So B. doesn’t have C. wash D. a lot 8. Choose the correct sentence that has the same meaning as the first one: Don’t throw trash, or we won’t have a green and clean place to live. A. If we don’t throw trash, we won’t have a green and clean place to live. B. If we throw trash, we will have a green and clean place to live. C. If we won’t throw trash, we will have a green and clean place to live. D. If we throw trash, we won’t have a green and clean place to live. 9. Choose the best answers: She’s sure that they will find the film_________. A. Entertain B. Entertained C. Entertaining D. entertainment 10. Odd one out: A. Oil B. Coal C. Biogas D. petrol 11. Odd one out: A. ship B. sailor C. boat D. train 12. Choose the correct sentence that has the same meaning as the first one: It’s a very silly mistake! A. What is a very silly mistake! B. What a silly mistake! C. What a mistake is very silly! D. What silly a mistake is! 13. Odd one out: A. man B. driverless C. pilotless D. automatic 14. Choose the best answers: ____________ being scary, Lan still liked going out at night so much. A. Although B. Nevertheless C. Despite D. In spite
Vote 5 sao luền tay cho mng luôn è
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