bài 1 (3x^n+1-2x^n).4x^2 bài 2 rút gọn biểu thức a)-2x(x+1)+(2x-3).(x-2) b)(2x-3).(2x-+3)-4x(x-1)+9 c)9x(3x^2-5x)-(3x+1).(9x^2-18x-1) d)3x^n(6x^n-3+1)-2x^n(9x^n-1) e)5(3x-4y^3)+(9(2x^2-y^3)-2(x^2-y^3)

giúp mik vs đc ko ạ mik vote 5 sao cho và lời cảm ơn

Mn ơi giải giúp em với em đag cần gấp ạ Em cho 5sao luôn ạ em đag cần

Giúp mình câu này với ạ đang cần gấp

Giúp mik vs nhanh vs ạ mik còn 20p

giúp mk với ! Tặng 5 sao + tim + ctlhn luôn đó ~

giúp em làm 1 ddoanj văn như trong hình

giúp mình ik mn ơi mình hứa cho5*và vote

I. Find the word which has a different sound in the underlined part. 1. A. put B. adult C. junk D. sun 2. A. itchy B. riding C. sick D. swimming 3. A. chemical B. children C. headache D. architect 4. A. regularly B. identify C. really D. healthy 5. A. cycling B. doctor C. aerobics D. calories II. Find the word which has a different sound in the underlined part. 1. A. coordinate B. triathlon C. allergy D. calorie 2. A. leaf B. life C. knife D. of 3. A. monopoly B. melody C. compound D. concentrate 4. A. paragraph B. cough C. although D. enough 5. A. vegetarian B. depression C. essential D. attention III. Choose the best one (A, B, C or D) to complete the sentence. 1. You should eat a lot of fruits and vegetables because they vitamin A, which is good for the eyes. A. run B. take C. provide D. get 2. The health from that diet expert is that you should eat less junk food and count your calories if you are becoming fat. A. advices B. ideas C. tip D. tips 3. The seafood I ate this morning makes me feel all over. A. itchy B. weak C. running D. well 4. If you want to be fit, stay outdoors more and do more activities. A. physics B. physic C. physical D. physically 5. Do more exercise eat more fruit and vegetables. A. and B. so C. but D. although 6. After working in computer for long hours, you should your eyes and relax. A. wake B. rest C. sleep D. sleep in 7. Eat less high-fat foods to keep you from fat. A. gaining B. reducing C. getting D. rising 8. We should follow the advice from doctors and health in order to keep fit. A. managers B. experts C. people D. workers 9. Have a healthy and you can enjoy your life. A. lifeline B. lively C. lives D. lifestyle 10. They go swims outside even when it’s cold. A. B. swiming C. swimming D. swam 11. Rob eats a lot of fast food and he on a lot of weight. A. spends B. brings C. takes D. puts 12. We need to spend less time computer games. A. playing B. to playing C. play D. to play 13. To prevent , you should eat a lot of garlic and keep your body warm. A. cold B. Mumps C. flu D. headache 14. Be careful with you eat and drink. A. who B. this C. what D. that 15. Eating a lot of junk food may lead to your . A. pain B. stomachache C. obesity D. fitness ko cần làm đâu

cứu gấp help my !!!!!!!!!!!!!!!!!!!!!!