căn 25-căn10 căn20.căn5 3 căn 20 - 2 căn 45+căn 25

Tìm x thỏa mãn 4/1.5+4/5.9+............+4/97.101=|5.(-4)/101|

1. The big television is more expensive than the small one. -> The small television ________________________________ 2. I don’t have a bookshelf in my room. -> There _________________________________________________.

“Thân em như tấm lụa đào Phất phơ giữa chợ biết vào tay ai.” Hình ảnh người phụ nữ này khác gì với hình ảnh người phụ nữ trong bài '' Bánh trôi nước''

hh A gồm hidro và hai anken đồng đẳng kế tiếp nhau. Đun nóng 2,576(l) A với xúc tác Ni đến phản ứng hoàn toàn thu được hh B. B làm mất màu dd Br2 đốt cháy hoàn toàn B thu được 11,22(g) CO2 và 5,04(g) H2O a/ Tìm CTPT của 2 anken b/ Tính %V từng khí trong hh A

cho phương trình x^2 + (2m-6) + m - 13 = 0 xác định m để phương trình có 2 nghiêm x1,x2 và biểu thức x1x2 - x1^2 - x2^2 đạt giá trị lớn nhất mong các cao nhân giúp e vs ạ

Cho tam giác MNQ cân tại M. Kẻ MH vuông góc với NQ a./ Chứng minh    MHN MHQ b./ HN HQ  c./MH là tia phân giác của góc NMQ d./ Kẻ HE vuông góc với MN tại E và kẻ HF vuông góc với MQ tại F. Chứng minh tam giác MEF là tam giác cân?

Hòa tan 8 gam CuO vào dung dịch H2SO4 9,8% vừa đủ thu được dung dung dịch A. Hạ nhiệt độ dung dịch A xuống 10oC. Tính khối lượng CuSO4.5H2O bị tách ra. Biết độ tan của CuSO4 ở 10oC là 10 gam ?

Câu 3 bài I A= (√x) / (√x-3) B= (x+7) / (√x) Đk: x>0; x khác 9 Cho S= (1/A) + B Tìm giá trị nhỏ nhất của S

Task 1. Put the words or phrases in the correct order. 1. our/ important/ an/ Sports and games/ in/ play/ lives/ part. ........................................................................................................................................... 2. players/ How/ match/ there/ in/ many/ are/ football/ a? ........................................................................................................................................... 3.to switch/ before/ go/ Don’t/ the TV/ off/ you/ forget/ to bed. ........................................................................................................................................ 4.Sunday/ I/ usually/ friends/ swimming/ on/ go/ mornings/ with/ my ........................................................................................................................................... 5.match/ you/ on/ the/ Did/ television/ last night/ watch/ basketball/ the? ........................................................................................................................................... Task 2. Choose the best item among A, B, C or D to complete the sentences. 1. Disney Channel is one of the most _____ channels _______ children. A. good - for B. exciting - of C. popular - to D. popular - for 2. My family enjoys watching game shows __________ they are very exciting and interesting. A. because B. so C. but D. and 3. VTV is a _________ television channel in Viet Nam, and it attracts millions of TV viewers in Viet Nam. A. wide B. local C. international D. national 4. "What is your ________ TV programme?" - "It's cartoons." A. good B. favourite C. best D. like 5.My brother wants to become a ________ to tell TV viewers what the weather is like. A. newsreader B. actor C. weatherman D. producer 6.TV ________ can join in some game shows through telephone or by mail. A. people B. weathermen C. newsreaders D. viewers 7.Are there any good programs ________ teenagers on TV tonight? A. to B. for C. of D. with 8.If you want to know what the weather is like tomorrow, watch the ________. A. weather forecast B. music show C. game show D. quiz show 9.My father works late tomorrow, so he will _______ the first part of the film on VTV1. A. miss B. lose C. forget D. cut 10."_____ is the weather forecast programme on?" - "At 7.30 pm every day." A. What B. How C. When D. Where Task 3. Read the passage, and answer the questions. HOW CAN WE KEEP OUR TEETH HEALTHY Firstly, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a toothbrush and flouride tooth paste at least twice a day – once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good for our teeth and our body such as milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables, and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. 1. How often should we visit our dentist a year? ....................................................................................................... 2.What should we brush our teeth with? ....................................................................................................... 3.What else we can use to clean between our teeth after a meal? ....................................................................................................... 4.What kinds of food are good for our teeth? ........................................................................................................ 5.What kinds of food are bad for our teeth? .........................................................................................................