His is name Tony

How

What

I don't 

Xin chào

Đề thi hk2 dễ thật đấy

Rearrange:

1) wearing/ I/ am/ T-shirt/ gave/ you/ birthday

2)me/ is/ in/ it/ copetion/ running/ my school

3)it/ took/ week/sister/ my/ last

4)sorry/am/I/ here/ about/ result/to

5)family/was/my/happy/fun/we/all/and

tui co day nhg dai lam

Tính các tổng sau:

A=\(\frac{n+2}{n-5}\)

với n khác 5

B=\(\frac{2n+3}{n+3}\)

với n khác -3

tui mai thi rùi đây nè chết mất

Tính

a)S₁=\(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{99.101}\)

b)S₂=\(\frac{5}{1.3}+\frac{5}{3.5}+\frac{5}{5.7}+...+\frac{5}{99.101}\)

c)S₃=\(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+...+\frac{1}{802.405}\)