Với a = 111....1 ( n chữ số 1 ) . Chứng minh rằng D là lập phương của một số nguyên .

Thay các chữ a,b bởi các số thích hợp để số m=______ chia hết cho3 và 5 13a5b

26. We _______ using energy-saving products. A. agree B. persuade C. convince D. suggest 27. Mr. Pitt still lives in a small flat _______ having a lot of money. A. although B. even C. in spite D. despite 28. Mrs. Brown, _______ son won the first prize in the language contest, feels very happy. A. who’s B. whom C. whose D. which 29. You should have a dictionary to _______ the words that you don’t know their meanings. A. look up B. look for C. look into D. look after 30. If he _______ late, we will go without him. A. comes B. came C. will come D. would come 31.Before being quick to judge someone for their actions, you should always try to put yourself in their …………... A. situation B. shoes C. heart D. feelings 32.As teenagers make the transition to adulthood, they often feel ……….. in the face of peer pressure and the demands of school and parental expectations. A. frustrated B. frustration C. frustrate D. frustrating 33.Magic number 18001567 is a …………… toll free service. A. 24 hours B. 24- hours C. 24- hour D. 24 hour 34.We should cooperate with others and resolve conflicts or have communication skills. It’s………….. A. Social skills B. Housekeeping skills C. Emotion control skills D. Self-care skills 35.“I’ve passed the final exam with very good result”---“………..! You deserve it after so much hard work”. A. Stay calm B. Congratulations C. Poor you D. That’s right 36.When you grow up, you’ll feel you want more………….. and responsibility. A. independence B. independent C. dependent D. dependence 37.I’ve lost my way. Please tell me how………… to the nearest police station. A. getting B. got C. to get D. get 38.I can't concentrate …….. my work with all that noise. A. in B. of C. on D. to 39.I said to Nick: “Where are you going?” A. I asked Nick where was he going. B. I asked Nick where he was going. C. I asked Nick where is he going. D. I asked Nick where he is going. 40.You’ve been a bit tense lately. So you need to……….. a break. A. get B. take C. enjoy D. let 41. Now that your children are teenagers, you may notice that their bodies will change in shape and………… A. height B. tall C. high D. weight 42.Do you need to be that stressed ………….? A. on B. off C. with D. out 43.Six people were invited to the party last night, but only one of them…………. A. Turned up B. Turned down C. Turned on D. Turned off 44.If you……………..me, what would you do? A.are B.were C.was D.have been 45.My mother is a strong person. She stays……………even in the worst situations. A.confident B.healthy C.calm D.fit 46.The doctor advised me…………….. up too late studying for the exam. A.Not to stay B.Not stay C.To stay D.stay GIÚP MIK VỚI,ĐANG GẤP LẮM.CẢM ƠN!!

chứng minh rằng : $\frac{1}{2 ²}$ + $\frac{1}{3 ²}$+ ......+ $\frac{1}{2021 ²}$ < $\frac{3}{4}$

Giúp mình với ak Mình đang cần gấp Mình xin cảm ơn trước :))

1) 5 (2x+3) ( x+2) -2 ( 5x-4) (x-1) 2) (10x+9) x- (5x-1) (2x+3) 3) 3 (2x-1) -5 (x-3)+6 ( 3x-4) 4) (3x-1) ( 2x+7) –(x+1) (6x-5) 5) (3x-5) (7-5x) + (5x+2) (3x-2)-2

Mọi người giúp em ạ Giải theo hệ thức lượng trong tâm giác vuông ạ Cho tam giác ABC có góc B =60° AC =13cm . BC -AC=7cm Tính AC và BC

hiện nay mẹ 36 tuổi, con gái 10 tuổi và con trai 5 tuổi .Hỏi mấy năm nữa số tuổi mẹ bằng số tuổi 2 con . Khi đó mẹ bao nhiêu tuổi

Ghi vào vở rồi chụp cấm ghi ra ngoài ko được coi là copy 🤬

mn kể lại truyện bằn tiếng anh Lưu ý : kể lại chứ ko phải viết theo trong truyện nhé