cho tam giác ABC lấy các điểm M,N,P sao cho \(\overrightarrow{MB}-2\overrightarrow{MC}=\overrightarrow{0},\overrightarrow{NA}+\overrightarrow{2NC}=\overrightarrow{0},\overrightarrow{PA}+\overrightarrow{PB}=\overrightarrow{0}\)
a)hãy biểu thị \(\overrightarrow{PM},\overrightarrow{PN}\)theo \(\overrightarrow{AB},\overrightarrow{AC}\)
b)chứng minh M,N,P thẳng hàng
viết lại câu sử dụng với have hoặc get
1:workers collect our rubbish twice a week (collect)
2:if you finish all your work early you can go early(finish)
3:the airline changed my flight for me yesterday (change)
4:we will have to arrange for someone to replace that broken windown (replace)
5:an engineer repaired my computer a couple of weeks ago(repair)
6:a well known designer made the dress for her (make)
7:a professional cleaner cleans their house for them (clean)
8:a local hairdresser does her hair once a month (do)
9:my passport will expire soon(renew)
10:i solved the problem as quickly as i could (solve)
điền từ vào đoạn văn sau (people,home,health,invitation,excitement,work,mother,page,literature,conversation)
Jane Auten was born in 1775.Her father was a parish priest at steventon and her(1).....was a good woman,who worried too much about her(2)......the family was not wealthy and the greatest(3)...that came into their lives was an(4)...to a party at the home of one of their richer neighbors.
Of course the young men who danced with jane and the callers who visited her(5)....had no idea that she was watching them and listening to their(6)..with special interest.This was the world and these were the(7)..she portrayed so successfully in her novels
At the time jane was writting the novel was not considered a respectable form of (8)....and it was almost impossible for a woman to publish a book under her own name.When sense and sensibility finally appeared in 1811,the words"by a lady"were printed on the title(9)....in 1833 pride and prejudice was published and it has become her best loved(10).......
cho tam giác ABC vuông ở A có AH là đường cao.Gọi M là điểm nằm trên cạnh AB.Một đường thẳng d đi qua M cắt cạnh AC tại điểm N sao cho HM vuông góc với HN.Gỉa sử đường thẳng MH cắt đường thẳng AC tại P,đường thẳng NH cắt đường thẳng AB tại Q. Tìm vị trí M để \(HM^2+HN^2\) đạt GTNN
cho phương trình
\(x^2-2\left(m+1\right)x+4m-2=0\)\
a)tìm m để pt có 2 nghiệm phân biệt
b)tìm biểu thức liên hệ độc lập với m của các nghiệm x1,x2
c)tìm m để pt có 2 nghiệm trái dấu
d)tìm giá trị của m để các nghiệm x1,x2 tm \(x1^2+x2^2-2x1^2x2-2x2x1^2=0\)