8x -16y = 24z - 18x = 9y -6z = và 2x - y + z = 54 Ai giúp mk vs

Để thích nghi với môi trường hoang mạc thực vật và động vật có những thay đổi gì? Vì sao?

C1:trong các biểu thức sau biểu thức nào chia hết cho 3 A.1×3×5+25 B.1×2×3×5-12 C.180-3×4×9 D.1×2×3×4×5-38 C2:trong các biểu thức sau biểu thức nào chia hết cho 9 có số dư là 2 À. (18+198+1039) B.18+36+47 C. (3×6+27) D.9×3-12

tìm tọa độ điểm M(-2;4) là ảnh của điểm N qua phép vị tự tâm O tỉ số k=2/3 tìm tọa độ điểm N

Hoàn cảnh sáng tác bài Nhàn của Nguyễn Bỉnh Khiêm?

tính a,3x(5x2-1) b,(12x2-8x3+6y):2y

Lập dàn ý bài văn tự sự kết hợp miêu tả, có độc thoại và độc thoại nội tâm Đề: Người em yêu quý nhất

Cho phương trình x^2-x-2-m=0 .Xác đinh m để phương trình có hai nghiêm phân bietex1,x2thoar mãn(x1^2-1)(x2^2-1)=-1|9

I. Choose the best answer by circling A, B, C or D: 1. -“What would you like to drink now?” - “ .” A. No, thanks B. Yes, please C. I like to do nothing D. Orange juice, please 2. All of us enjoy to classical music. A. listen B. listens C. listening D. listened 3. She worked very hard, _she passed all her exams. A. because B. and C. so D. but 4. Hoa looks red. She was outdoors yesterday. Perhaps she has _ A. flu B. sunburn C. spots D. stomachache 5. My family has decided to use _ electricity by using more solar energy instead. A. more B. less C. much D. fewer 6. I ................playing board games interesting because I can play them with my friends. A. find B. think C. say D. tell 7. -“ Would you like me to turn off your computer? - “...............................I’ll do it myself” A. No, thanks B. Yes, please C. Don’t do it D. Of course 8. You like playing monopoly or chess, your hobby may be . A. collecting things.B. playing sports C. dancing D. board games 9. I .......................Nha Trang when I was a child. A. visit B. visited C. will visit D. have visited 10. He ..................... to the USA so far. A. is B. was C. will be D. has been 11. Americans eat a lot of junk food,................. junk food causes obesity. A. but B. and C. so D. because 12. Tim: I feel itchy and my nose is running. Doctor: ............................. A. Wash your hair more. B. I think you have the flu. C. Drink more water. Eat less meat D. I think you have a stomachache. 13. Pick out the word whose main stress is placed differently from the other A. allergy B. headache C. temperature D. obesity 14. Choose the word that has the underlined part pronounced differently from the others. A. cold B. curly C. ocean D. clothes II. Choose the best answer to complete the passage: Headache is a very common disease. The symptoms (1)........ a headache are various. People may (2)........... pains only one side of the head. Sometimes when the pain goes away, the head is sore. People have a headache (3) ............. they work too hard or they are too nervous about something. (4)........... can help cure the disease but people usually have to do more than taking tablets. They can prevent headaches by changing their diets or their (5)............... or simply by going to bed. 1. A. on 2. A. be B. in B. have C. of C. happen D. at D. take 3. A. when B. but C. so D. and 4. A. Medicine B. Doctor C. Sport D. Fruit 5. A. life B. lifestyles C. hobbies D. working

Thân cây dài ra do sự phân chia tế bào ở