a + b = 2015 => a = 2015 - b

=> Q = [2(2015 - b) + b]/[(2015 - b) + 2015] + [2b + (2015 - b)]/(b + 2015)

Q = [2.2015 - b]/[2.2015 - b] + [b + 2015]/(b + 2015)

Q = 1 + 1 = 2

Tình iu con gái như thể hái hoa
 

Ta có 2H = 2.(2²⁰¹⁰ - 2²⁰⁰⁹ - 2²⁰⁰⁸ - ... - 2 -1)

2H = 2²⁰¹¹ - 2²⁰¹⁰ - 2²⁰⁰⁹ - ... - 2² - 2

2H - H = 2²⁰¹¹ - 2²⁰¹⁰ - 2²⁰⁰⁹ - ... - 2² - 2 - 2²⁰¹⁰ + 2²⁰⁰⁹ + 2²⁰⁰⁸ + ... + 2 + 1

H = 2²⁰¹¹ - (2²⁰¹⁰ + 2²⁰¹⁰) - (2²⁰⁰⁹ - 2²⁰⁰⁹) - (2²⁰⁰⁸ - 2²⁰⁰⁸) - ... - (2 - 2) + 1

H = 1

=> 2010^H = 2010¹ = 2010

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

Question 18: When I was turning out my cupboard I        __________ this photograph of my uncle.

A. came over

B. came round

C. came across

D. came into