Tính giá trị biểu thức: A=(1-1/1.2) + (1-1/2.3)+...+(1-1/2015.2016)

 A=1−11.2+1−12.3+...+1−12015.2016       =1+1+1+...1−11.2+12.3+...+12015.2016       =2015−1−12+12−13+13−14+...+12015−12016       =2015−1−12016       =2015−1+12016       =2014+12016       =40602252016