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NM
2
3 tháng 10 2021
\(M=x^4-4x+7=\left(x^2-4x+4\right)+3=\left(x-2\right)^2+3\ge3\)
\(minM=3\Leftrightarrow x=2\)
\(P=x^2-6x+y^2-2y+12=\left(x^2-6x+9\right)+\left(y^2-2y+1\right)+2=\left(x-3\right)^2+\left(y-1\right)^2+2\ge2\)
\(minP=2\Leftrightarrow\)\(\left\{{}\begin{matrix}x=3\\y=1\end{matrix}\right.\)
HP
1
DT
Đỗ Thanh Hải
CTVVIP
28 tháng 7 2021
1 C
2 D
3 B
4 A
5 D
6 A
7 A
8 D
9 B
10 C
IV
1 affected
2 practical
3 environmentalist
4 picnicking
5 outstanding
V
1 to have - built
2 broke - was being moved
3 doing - to answer
4 are -laughing - Have - been telling
5 will have finished
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 5 2021
1 A lot of tourist are attracted by Hoi An
2 The living room is being painted light blue
3 Many different paper products have been developed
4 These rooms are cleaned by my sister everyday
5 English is being study by him now
6 English songs are being sung by her sister
7 A hospital is being built there
8 The passive voice is being practised by us
DT
Đỗ Thanh Hải
CTVVIP
19 tháng 10 2021
1 Sue wishes she hadn't bought that new book
2 Unless you walk faster, you will be late
3 Carol spent 2 hours fixing the television sets
4 I make these handicrafts by myself
5 If I were you, I would take the bus instead of the train
II
1 She doesn't have to get up early on Saturday
2 Children mustn't be left alone in car
3 John must explain this if he want his student to succeed
4 I have to file the report this week
5 We don't have to work overtime on Saturdays
6 You mustn't drive more than 25 mph in this zone
7 She didn't have to attend the presentation yesterday
8 She has to pick up her children at school
9 You don't have to arrive before 8
10 They had to visit the doctor yesterday as they didn't feel well
MS
25 tháng 5 2016
Bạn vừa luyện ngữ pháp, đọc, nghe từ dễ đến khó trên duolingo cũng được đó!
8, were
9,don't hurry
10,doesn't spend
1, Lan is shorter than Trang
2,Lan isn't as tall as trang
3,Mr John is the best teacher in this school
4,My house is the smallest in the village
5,Learning Chinese is more difficult than learning English