Có hình ko bạn 

\(C=\left(x^2-1\right)\left(x^2+1\right)\left(x^4+1\right)\left(x^8+1\right)\left(x^{16}+1\right)\left(x^{32}+1\right)-x^{64}\\ =\left(x^4-1\right)\left(x^4+1\right)\left(x^8+1\right)\left(x^{16}+1\right)\left(x^{32}+1\right)-x^{64}\\ =\left(x^8-1\right)\left(x^8+1\right)\left(x^{16}+1\right)\left(x^{32}+1\right)-x^{64}\\ =\left(x^{16}-1\right)\left(x^{16}+1\right)\left(x^{32}+1\right)-x^{64}\\ =\left(x^{32}-1\right)\left(x^{32}+1\right)-x^{64}\\ =\left(x^{64}-1\right)-x^{64}\\ =-1\)

Vậy đa thức ko phụ thuộc vào x

\(y\left(x-y\right)\left(x+y\right)\\ =y\left(x^2-y^2\right)\\ =x^2y-y^3\)

\(x\left(x+y\right)\left(x^2+y^2\right)\left(x^4+y^4\right)\left(x^8+y^8\right)\left(x-y\right)+xy^{16}\\ =x\left(x+y\right)\left(x-y\right)\left(x^2+y^2\right)\left(x^4+y^4\right)\left(x^8+y^8\right)+xy^{16}\\ =x\left(x^2-y^2\right)\left(x^2+y^2\right)\left(x^4+y^4\right)\left(x^8+y^8\right)+xy^{16}\\ =x\left(x^4-y^4\right)\left(x^4+y^4\right)\left(x^8+y^8\right)+xy^{16}\\ =x\left(x^8-y^8\right)\left(x^8+y^8\right)+xy^{16}\\ =x\left(x^{16}-y^{16}\right)+xy^{16}\\ =x^{17}-xy^{16}+xy^{16}\\ =x^{17}\)

\(A=\dfrac{3+\sqrt{3}}{\sqrt{3}}-\dfrac{2}{\sqrt{3}+1}+1\\ =\dfrac{\sqrt{3}\left(\sqrt{3}+1\right)}{\sqrt{3}}-\dfrac{2\left(\sqrt{3}-1\right)}{3-1}+1\\ =\sqrt{3}+1-\dfrac{2\left(\sqrt{3}-1\right)}{2}+1\\ =\sqrt{3}+1-\left(\sqrt{3}-1\right)+1\\ =\sqrt{3}+1-\sqrt{3}+1+1\\ =3\)

A \ B = {0,1}

B \ A = {5;6}

(A\B) U (B\A) = {0;1;5;6}

=> A

TYPE 1: BÀI TẬP CÂU SO SÁNH HƠN
Tập nhận biết: Các câu ở dạng so sánh hơn sẽ có 2 đối tượng để so sánh và trong câu có từ
“than”. Khi làm bài cần lưu ý xác định tính từ trong ngoặc là tính từ ngắn hay tính từ dài để
sử dụng cấu trúc tương ứng
1. His voice is ( sweet ) ______sweeter__________________than Hoa
2. Dogs are(intelligent) ________more intelligent________________than cats
3. My Math class is (boring) ________more boring________________than my English class...
4. China is far (large) _________larger_______________than the UK...
5. My hair is (short)____________shorter____________ than Betty’s.
6. This flower is(beautiful) _________more beautiful_______________than that one.
7. Tuan is ______better___________ than Hung ( good)
8. English is _________more difficult_____________ than Vietnamese ( difficult)
9. Lisa’s weight is _______heavier__________ than her sister ( heavy)
10. Non-smokers’ life is (long) _______longer_________________than smokers’

TYPE 2:BÀI TẬP SO SÁNH HƠN NHẤT
Tập nhận biết: Các câu ở dạng so sánh hơn nhất thường chỉ có 1 đối tượng duy nhất, sau tính
từ sẽ là 1 danh từ. Khi làm bài cần lưu ý xác định tính từ trong ngoặc là tính từ ngắn hay tính
từ dài để sử dụng cấu trúc tương ứng. Các con lưu ý thêm “the” trước tính từ so sánh hơn nhất
1. My Tam is one of (popular) _______the most popular_________________singers in my country.
2. This is (exciting) ______the most exciting__________________film I’ve ever seen.
3. Summer is____________the hottest____________season of the year (hot)
4. Dogs are(intelligent) __________the most intelligent______________in my zoo
5. Which is the (dangerous) _________most dangerous_______________animal in the world?
6. This is (exciting) ________the most exciting________________film I’ve ever seen
7. The weather this summer is even (bad) _________worse_______________than last summer.
8. Who is the (rich) _________richest_______________woman on earth?
9. He was the (clever) _________ cleverest_______________thief of all.
10. Her daughter is (beautiful) ________the most beautiful________________ in her family

He said that he wanted a camera for his birthday

Tim asked his Boss if he would find a job the next week

Peter asked Janet if He could borrow his typewriter

She asked us not to use too much hot water

The office manager asked his employ why he hadn't got computer before

He said that he had bought some popcorn the day before 

\(y=tan15x=\dfrac{sin15x}{cos15x}\\ ĐK:cos15x\ne0\\ \Rightarrow\left[{}\begin{matrix}x\ne\dfrac{\pi}{30}+\dfrac{k2}{15}\\x\ne\dfrac{-\pi}{30}+\dfrac{k2}{15}\end{matrix}\right.\)

\(\Rightarrow TXĐ:R/\left(\dfrac{\pi}{30}+\dfrac{2k}{15};\dfrac{-\pi}{30}+\dfrac{2k}{15}\right)\)

a, Tổ bác Diễm nhận đan số chiếc hộp cói là : \(1000\times\dfrac{1}{4}=250\left(chiếc\right)\)

b,  Con rô bốt phải chuyển : \(250\times\dfrac{3}{2}=375\left(kg\right)\)