Bài 1 Tính\(\frac{A}{B}\)biết
a)A=\(\frac{1}{1.300}+\frac{1}{2.301}+\frac{1}{3.302}+...+\frac{1}{101.400}\)
B=\(\frac{1}{1.102}+\frac{1}{2.103}+\frac{1}{3.104}+...+\frac{1}{299.400}\)
b)A=1/2+1/3+1/4+...+1/200
B=1/199+2/198+3/197+...+199/1
c)A=1-1/2+1/3-1/4+...+1/2007-1/2008
B=1/1005+1/1006+1/1007+...+1/2007+1/2008