Tính :
a. T = \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+....+\dfrac{1}{99.100}\)
b. H = \(\left(1-\dfrac{1}{2}\right).\left(1-\dfrac{1}{3}\right)......\left(1-\dfrac{1}{n+1}\right)\) với n e N
c. B = \(-66.\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)+124.\left(-37\right)+63.\left(-124\right)\)
a) = 1-1/2+1/2-1/3+...+1/99-1/100 =1 - 1/100 = 99/100