user-avatar
Thanhyen5117
2 năm trước
tìm x để biểu thức sau có nghĩa a) √x+3 + √ x ²+9 b) 1/ √4x ²-12x+9 c) √x-2+1/x-5 d) 2/x ²-9 - √5-2x các bạn giúp mik với nhé. Ai xong trước mình tick cho 5 sao. Cảm ơn nhiều
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the best answer to complete each of the following sentences. 30. My close friend draws very well. She will be a …………. artist one day. A. fame B. famous C. famously D. famed 31. We ________ swimming because it’s fun and good exercise. A. like B. are liking C. will like D. liked 32. My grandparents don’t like ________ in the city because it’s noisy and crowded. A. live B. lived C. living D. to living 33. Fire needs oxygen to burn. It ________ without oxygen. A. burn B. burns C. don’t burn D. doesn’t burn 34. How much time do you spend ________ the Internet per day? A. surf B. to surf C. surfing D. to be surfing 35.I don’t mind ________ a DVD, but I prefer ________ to the cinema. A. to watch - to go B. watching – go C. to watch – going D. watching – to go 36. _____ is her father's hobby. He likes going to the zoo to see beautiful parrots or canaries. A. Collecting birds B. Raising pets C. Bird-watching D. Arranging flowers 37. My mother loves ____ She usually grows vegetables and takes care of them when she has free time. A. cooking food B. gardening C. cycling D. eating fruits 38. My brothers would like to_____ mountain climbing. They think they will enjoy themselves and _____ some nice photos. A. go/ take B. pick/take C. take/collect D. go/pick 39. I prefer listening to music____ very much. Gentle and nice lyrics of old songs always attract my attention. A. headphones B. noise C. colours D. melodies 40. My father will go_____ on the sea when my family goes to the beach this week. A. gymnastics B. camping C. horse-riding D. surfing 41. I love making ____ because I can create some nice and unique clay bottles or cups to give my friends. A. pottery B. paper kites C. architectures D. lanterns 42. __ is my unusual hobby. I like moving on the ice and feel like a beautiful swan. A. Swimming B. Eating ice-creams C. Ice-skating D. Making models 43. She took__ playing the piano when she was a young girl. A. in B. over C. up D. on 44. He ____ karate club next month. He_____ to improve his health. A. will join/ wants B. joins/wants C. will join/ will want D. is joining/ wants 45. Our grandfather he ___us how to carve eggshells this weekend. A. will promise/will show B. is promising/shows C. promises/will show D. promised/shows 46. My mother____ me to the museum tomorrow because she______ to finish a lot of her work. A. doesn't take/ has B. won't take/ has C. won't take/ doesn't have D. doesn't take/ doesn't have 47. The bus___ in two minutes. I ____late for school when I _____it. A. arrives/ will be/ miss B. will arrive/ will be /miss C. arrives/ am/ will miss D. will arrive/ am/ will miss 48. My brother hates______ horror films. They make him________ scary a lot. A. to watch/ feel B. watching/ to feel C. to watch/ to feel D. watching/ feel 49. It's interesting______ a puppy. I enjoy_____ after it very much. A. having/ looking B. to have/ to look C. having/ to look D. to have/ looking 50. One of my favorite hobbies is_____ comics. I love_______ more famous ones. A. read/ collecting B. reading/collecting C. to read/ to collect D. reading/ collected

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team