P(x) = x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x

=x⁵+7x⁴-9x³-2x²-1/4x

Q(x) = 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4         

=-x⁵+5x⁴-2x³+4x²-1/4

P(x)+Q(x)=x⁵+7x⁴-9x³-2x²-1/4x -x⁵+5x⁴-2x³+4x²-1/4

=x⁵-x⁵+7x⁴+5x⁴-9x³-2x³-2x²+4x²-1/4x-1/4

=12x⁴-11x³+2x²-1/4x-1/4

P(x)-Q(x)=x⁵+7x⁴-9x³-2x²-1/4x +x⁵-5x⁴+2x³-4x²+1/4

=x⁵+x⁵+7x⁴-5x⁴-9x³+2x³-2x²-4x²-1/4x-1/4

=2x⁵+2x⁴-7x³-6x²-1/4x-1/4

sắp xếp

1.stay / grandparents / vacation / are / with / next / we / to / our / going / summer

we are going to stay with our grandparents next summer vacation

2.in / the / Nile River / the / longest / the / is / word / river

Nile River is the longest river in the world

3.good / the / there / let's / and / time / beach / go / have / to / a

let's go to the beach and have a good time there

4.sister / home / rides / and / my / at / has / lunch / twelve / a / to / quarter

my sister rides home and has lunch at a quarter to twelve

5." No parking " / here / so / sign / mustn't / says / park / this / we

this sign says " No parking " so we mustn't park here

d) x^3 + 2x^2 + 3x + 1 

Bó tay  

e) x^2 - 2x - 4y^2 - 4y 

= x^2 - 2x + 1 - 4y^2 - 4y - 1 

= ( x + 1 )^2 - ( 4y^2 + 4y + 1 )

= (  x + 1 )^2 - ( 2y + 1 )^2 

= ( x+ 1 - 2y - 1 )( x + 1 + 2y + 1 )

= ( x - 2y )(x + 2y +2 )

4x2 là gì 

Đặt câu hỏi cho câu trả lời:

1. Phuc is a stylist.

what does Phuc do? / what is Phuc's job?

2. Mai works at the famous company

where does Mai work?

3. This is Long 's Car

whose car is this?

4. The House is near to the Drugstore

where is the house?

C.Today fast food is very

K.popular throughout the word .In

E.a fast food restaurant , you can

I.get differnt kinds of food cheaply and quickly

G.You can even take it home

A.For example ,you can get hot dogs

J.or beefburger in paper bags

F.and boxes. MacDuff''s is the name of

B.a famous fast food restaurant.Do you

H.know that a beefburger in MacDuff''s in London tastes

D.the same as one in MacDuff''s in Tokyo

1. Take medical and you will feel well again .

medical=> medicine , well=> good

2.She seemed fair tired after finishing that task.

fair=> fairly

3. How could you be so cruel with someone who never did you any harm ?

with=> to

4. Late at Christmas Eva, Santa comes down the chimney any puts presents under the tree.

at=> on

5. He said that his mother was a good cooker.

cooker.=> cook

6. The plane landed on Noi Bai airport just before midday.

on => at

7.This time last Monday we took the final test.

took=> were taking

8.Don't tell him about this. -No, I don't

don't=> won't

9. The house build in the nineteenth century has collapsed.

build=> built

Who are those boys?-Mrs.Hoa's children.

1.does phong is school have forty classrooms?are there forty classrooms in Phong's school?

2.phuong has a brother ,nam.phuong is Nam's sister

3.my father usually drives to work?my father usually goes to work by car

our house is older than any other house in the living centre

= Our house is the oldest house in the living centre

We didn't enjoy the trip because of the heavy rain

=The heavy rain prevented us from enjoying the trip

The visitor spoke too quickly that I couldn't understand what he said

=The visitor spoke too quickly for me to understand what he said