a,
`(-1/3)^2.(-1/3)`
`=(1/3)^3=1/27`
b,
`(-2)^2.(-2)^3`
=`(-2)^5=-32`
c,
`a^5. a^7`
`=a^(5+7)`
`=a^12`
Đáp án:
Giải thích các bước giải: theo công thức x^m.x^n=x^m+n
31. Mr. Lam suggested that we tonight. A. worked late B. working late C. should work late D. would work late 32. She is the most intelligent woman I’ve ever met. A. whom B. who C. whose D. that 33. I recently went back to Paris, I was born nearly 40 years ago. A. which B. where C. that D. when 34. Mr. Jones is very rich. He work hard for a living. A. mustn’t B. shouldn’t C. can’t D. doesn’t have to 35. I have a pen pal in Singapore. We each other at least once a month. A. comprise B. divide C. consist of D. correspond with 36. I usually jeans and a T-shirt on the weekend. A. wear B. get C. take D. put off 37. You needn’t do that when the maid is here, ? A. do you B. need you C. is she D. isn’t she 38. I wish we shopping here together. A. will go B. would go C. go D. to go 39. He asked his son back as soon as possible. A. comes B. to come C. came D. coming 40. Many tourists enjoy festivals in Vietnam they don’t speak Vietnamese. A. although B. when C. if D. because
$3x^{2}$ +21x+18=2-2 $\sqrt[]{x^{2}+7x+7 }$
1. My mother never allows me to go out alone at night. → My mother never lets _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2. We turned off the lights and then we went out. → Before _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3. I started working in this hotel six months ago. → I have _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 4. He left the party early. ( I saw ) → I saw _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5. We / happy / know / that / you / win / a scholarship / study aboard. ( use the given words to make a meaningful sentence ) → _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ giúp dùm em vs e cảm ơn
Exercise 5: Supply the correct forms of words in brackets 1. This chair is………………… than that chair (comfortable) A. more comfortable B. comfortabler C. the most comfortable D. comfortable 2. Your flat is…………………..than mine ( large) A. more large B. more larger C. larger D. large 3. This dress is…………………..than that one (pretty) A. prettier B. more pretty B. more prettier D. prettier than 4. The………………city in Canada is Toronto. (large) A. largest B. most large C. most largest D. larger 5. The Nile is the………………river in the world (long) A. most longest B. longest C. most longgest D. longgest 6. My mother’s cooking is………………than my mother’s (good) A. gooder B. more gooder C. better D. better good 7. My father’s cooking is………………..than my mother’s (bad) A. worse B. worst C. badder D. bad 8. I think good health is the……………….. thing in the life (important) A. importantest B. most important C. more important D. the most important 9. Mt. Everest is………………………mountain in the world. (high) A. higher B. the highest C. the most highest D. most highest 10. Canada is……………………...the United States in area. (big) A. biggest B. bigest C. the biggest D. the most biggest 11. Peter finished his work…………………… of all (fast) A. fastest B. the most fastest C. the fastest D. the more fastest 12. You can write………………….I can (well) A. better B. worse C. more well D. weller 13. Sally got………………….. food on the menu for dinner last night (expensive). A. the most expensive B. most expensive C. more expensive D. expensive 14. The Wilsons arrived at the party………………….. of all (early). A. earliest B. the earliest C. the most early D. earlier 15. February is …………………..month of the year. (short) A. the shortest B. the most shortest C. shorter D. shorter than 16. In my opinion, Harry’s Steak House is………………….. restaurant in the city ( bad). A. the worst B. the worse C. the bad D. the most
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các bạn ởi giải hộ mình với ạ mình đangg cần gấp ạ cảm ơn
Ai giải giùm em câu 1.6, 1.7, 1.9 với !!! Cần gấp ạ !!!
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