last summer, you had a trip to sea. Write a paragraph about it.

Help me !!!

chứng minh:\(\dfrac{x^2}{1+16x^4}+\dfrac{y^2}{1+16y^4}\le\dfrac{1}{4},\forall x,y\in R\)

Chứng minh: a\(^{1995}\)> 1995(a-1), a>0

cho a, b > 0. Chứng minh: \(\left(1+\dfrac{a}{b}\right)^m+\left(1+\dfrac{b}{a}\right)^m\ge2^{m+1}\), với m\(\in\)Z\(^+\)

* Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

He's left his book at home; he's always so..................

A. forgetful  

B. forgettable 

C. forgotten 

D. forgetting

Cho hình vẽ:

Hỏi hình bên có bao nhiêu góc vuông?

A. 1 

B. 2 

C. 3  

D. 4