K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
HY
17 tháng 2 2020
1. Chắc là đổi từ foodball sang soccer á.
2. Last week, I went to the museum with my friend.
3. He couldn't sleep so he turn on the TV to watch sme programs.
4. Sửa wich thành which
17 tháng 2 2020
Fix
Each sentence has a mistake. Find the mistake and correct them.
1) Tony is a good foodball player. He plays football very good. => well
3) He couldn't sleep so he turn off => turned on the TV to watch some programs.
4) Neil Armstrong, wich => who first walked on the moon lived in the USA.
9 tháng 12 2017
a. \(\dfrac{\left(x^2+2x\right)}{\left(x+2\right)^2}=\dfrac{x\left(x+2\right)}{\left(x+2\right)\left(x+2\right)}=\dfrac{x}{x+2}\)
b. \(\dfrac{x^2-7x+12}{x^2-6x+9}=\dfrac{x^2-3x-4x+12}{\left(x-3\right)^2}\)
\(=\)\(\dfrac{x\left(x-3\right)-4\left(x-3\right)}{\left(x-3\right)\left(x-3\right)}=\dfrac{\left(x-4\right)\left(x-3\right)}{\left(x-3\right)\left(x-3\right)}=\dfrac{x-4}{x-3}\)
c. \(\dfrac{x^2-5x+6}{x^2-x-2}=\dfrac{x^2-2x-3x+6}{x^2-2x+x-2}\)
\(=\dfrac{x\left(x-2\right)-3\left(x-2\right)}{x\left(x-2\right)+\left(x-2\right)}=\dfrac{\left(x-3\right)\left(x-2\right)}{\left(x+1\right)\left(x-2\right)}=\dfrac{x-3}{x+1}\)
d. \(\dfrac{\left(x+y\right)^2-z^2}{2\left(x+y+z\right)}=\dfrac{\left(x+y-z\right)\left(x+y+z\right)}{2\left(x+y+z\right)}=\dfrac{x+y-z}{2}\)
14 tháng 10 2018
a .
a. =x3 -x2-4x2+4x+4x-4=(x-1)(x2-4x+4)=(x-1)(x-2)2
b. =x3+x2-6x2-6x+9x+9=(x+1)(x-3)2
c. =x3+x2+7x2+7x+10x+10=(x+1)(x+2)(X+5)
d. =x4+x3+x3+x2+x+1=x3(x+1)+x2(x+1)+x+1=(x+1)(x3+x2+x)=x(x+1)(x2+x+1).Ok
30 tháng 11 2017
\(Đặt A=(n^4-3n^3+n^2-3n+1):(n^2+1) \)
\(=(n^4+n^2-3n^3+n^2-3n+10):(n^2+1)\)
\(=[n^2(n^2+1)-3n(n^2+1)+1]:(n^2+1)\)
\(=[(n^2+1)(n^2-3n)+1]:(n^2+1)\)
Để A thuộc Z thì tử phải chia hết cho mẫu mà\((n^2+1)(n^2-3n) \) chia hết cho \(n^2+1\)
=> 1 chia hết cho \(n^2+1\)
=> \(n^2+1\) thuộc Ư(1)
mà \(n^2+1>=1\) (với mọi n)
=>\(n^2+1=1\)
=>n=0
Vậy....................
KD
28 tháng 11 2018
Every 14th day of the lunar month, Hoi An old (1)town.....bans all motorized traffic and transforms itself in to a massive .(2)performance ..........venue for Vietnamese arts contemporary to the old trading town's heyday in the 18th to 19th .(3)century........- chinese opera , chinese chess and of course, the region's famous food.
Shops put up brightly -coloured (4).lanterns......turning the narrow old streets into a radiant festively - illuminated light spectacle, angmented by the baunting strains os(5).traditional...... music andible from just about every where in the old town. Just for the night you won't be required to by or show a(6).ticket...... to enter Hoi An's old attraction . The temple are at their busiest (7)during..... the full Moon festival as the local lionor their(8).ancestors...... during this auspicious time of the month.
Chúc bạn học tốt 
27 tháng 8 2018
1.don't eat
2.do you do/go
3.Is he listen
4.flow
5.buys
6.go/boil
NA
27 tháng 8 2018
1, Vegetarians ( not eat ) . .don't eat . . . meat .
2, What . .did . . . you ( do ) . . do. . . every night ?
- I ( go ) . .went . . to my aunt's house .
3, Does He ( listen ) . listen. . . . to music after school ?
4, Most rivers ( flow ) . flow. . . . into the sea .
5, My dad sometimes ( buy ) . .buys . .vegetables at this market.
6, They ( go ) . . go.. fishing on Sunday.
Water ( boil ) . . . . .boils . 1000C.
kb mk nha
tk nữa
Không đăng câu hỏi linh tinh