tính giá trị của biểu thức: `x^3-6x^2+12x+2013` tại `x=2`

Tìm tham số để phương trình 2(m^2+1)cos^2x=m^2+m+4

x : 8 = 45 : 5 x : 2 = 2345

Giúp mình với , đang cần gấp lắm

Tại sao hiện tượng di truyền phân tính lại không xảy ra với các cây tự thụ phấn nghiêm ngặt ?

I.Choose the correct answer. 11.We should play sports or do exercise in order to stay in . A.look B.shape C.fit D.health 12.Don’t eat that type of fish: you may have a/an . A.sick B.sore C.energy D. allergy 13.Do you believe that eating carrots helps you see at night? A.much more B.less C.most D.the most 14.We should try to keep everything around US clean and then flu will find it to spread. A.difficult B.difficulty C.difficultly D.difficulties 15.Be careful with you eat and drink. A.what B.that C.who D.this 16.Eating a lot of junk food may lead to your . A.obesity B.fitness C.pain D.stomachache 17.We should follow the advice from doctors and health in order to keep fit. A.people B.workers C.managers D.experts 18.Have a healthy and you can enjoy your life. A.lives B.lifestyle C.lifeline D.lively 19.The health from that diet expert is that you should eat less junk food and count your calories if you are becoming fat. A.tip B.tips C.advices D.ideas 20.The seafood I ate this morning makes me feel all over.

tỷ lệ hạt sống cao chứng tỏ hạt giống đấy sẽ như thế nào?

Giúp mình câu c,d bài 8 Câu c bài 9 Câu b bài 10

I . True or False sentenses 1.They often eat there meals a day - breakfast , lunch and dinner 2.They have lunch at 11:30 3.Diner don't often starts about 8:00 in evening 4.They don't eat vegetables II.Answer the questions 1.What do people in Nam's city have for breakfast? ....................................................... 2.What time do they have for lunch? .................................................... 3.Which is the main meal of the day? ................................................... 4.Do people in his city have some fruit and a glass of green tea after dinner? ............................................ III.wire sentenses using (not) as... as and given words ( 1point) 1.My house / not big / your house ........................................................ 2.Hoa / beautiful / Lan ........................................................ 3.This table / not tall / that one ....................................................... 4.Her class / clean / his class .......................................................

Giảii giúp em với tìm tập xác định của hàm số