Ta có :
\(A=75\left(4^{10}+4^9+...+1\right)+25\)
\(\Rightarrow A=75.4^{10}+75.4^9+....+75.4+75.1+25\)
\(\Rightarrow A=300.4^9+300.4^8+....+300+100\)
=> A chia hết cho 100
cho n là só tự nhiên, chứng minh rằng n(n + 1)(n+2) chia hết cho 6
Tìm số tự nhiên a khác 0 nhỏ nhất biết:
4) a chia cho 20 ; 48 có cùng số dư là 4
tìm x thuộc z sao cho:
(2x+1) chia hết (x-3)
3n-1 chia hết cho 3-2
Giúp mình với
Fill in each gap in the passage with one suitable word from the box.
[ have / give / decorate / first / envelopes / wishes / shopping / festival / gatherings / love ]
Tet is a national and family (41)_____. It is an occasion for every Vietnamese to (42)_______ a good time while thinking about the last year and the next year. At Tet, people (43)______ streets and public buildings, almost all shops are crowded with people (44)______ for Tet. Tet is the time for family (45)______. At home, everything is tidy; people cook special food. First-footing is made when the (46)_______visitor come, and parents give children lucky money in red (47)_______. Tet is also a time for peace and (48)________. During Tet, friends, relatives, and neighbours (49)_____ each other their best (50)_______ for the new year.
41. My sister (get)______________ dressed and (brush)_______________her teeth herself at 6.30 everyday.
42. Mrs. Smith (not live)_______________in downtown. She (rent)________________in an appartment in the suburb.
43. How _________your children (go)_________________to school everyday?
44. It’s 9 o’clock in the morning. Lien (be)________in her room. She (listen) _______________to music.
45. We_______________________(play) soccer in the yard now.
46. My father (go)___________ to work by bike. Sometimes he(walk)______________.
47. _________You (live)________near a market? _ It (be)____________noisy?
48. Now I (do)_____________the cooking while Hoa (listen)_______________to music.
49. At the moment, Nam and his friends (go)_______________________shopping at the mall.
50. In the autumn, I rarely (go)______________sailing and (go)__________to school.
46. Are you interested………… history?
47. Is she good ………… English?
48. I agree ………… you about that.
49. The beef is on the table …….. ……the eggs and the fish..
50. My father always goes to work ………… car.
Write the correct form of words.
41. Today is a ___________ day. Why don't we go camping ? (Sun)
42. What about go ___________ this weekend? (Ski)
43. How many _____________ are there in this room? (woman)
44. It is __________ of you to say such bad things. (Kind)
45. She was ______ because she didn't talk to anyone (Friend)
46. I like go _________. So does my father (fish)
47. Do you want to become a _______ ? (Science)
48. There are many _______ on this road. (build)
49. This river is _______ because people throw trash here (Pollute)
50. The flowers are ______ (Colour)
51. It is _________ to buy a house in London. (Expense)
52. Independent day is the _____________ day of each country (Historiy)
53. Your room is _______. Clean at once! (Dirt)
54. This movie is ___________, isn't it ? (Bore)
55. The city is ___________. (Noise)
V. Insert the correct form of the words in brackets:
41. He is sure to have an accident because he drives very ……. (care)
42. When Mrs Lien was young, she wanted to be an activities (act)
43. Ask a ......... to type your application form for you (type)
44. Do you like ... music? (tradition)
45. Videos are also very useful in…………………. (educate)
46. Mr. Bean has a very ………………………………… tooth. (pain)
47. It is very…….. to drive a car fast in a busy street. (danger)
48. Mary looked ………….because her mother died. (happy)
49. When I go to the library, I sit and reach about ………….. things. (wonder)
50. Edison ………………..the electric bulb. (invention)
