Bài 1 :Cho A =\(\frac{1}{1.101}\)+\(\frac{1}{2.102}\)+\(\frac{1}{3.103}\)+ . . . +\(\frac{1}{10.110}\)
B =\(\frac{1}{1.11}\)+\(\frac{1}{2.12}\)+\(\frac{1}{3.13}\)+ . . . + \(\frac{1}{100.110}\)
Tính A : B
Bài 2 :Cho A= 1+\(\frac{3}{2^3}\)+\(\frac{4}{2^4}\)+\(\frac{5}{2^5}\)+ . . .+\(\frac{100}{2^{100}}\). Rút gọn A