Thực hiện phép tính(Tính nhanh nếu có thể):
a) 0,25.\(\dfrac{12}{5}\).\(\dfrac{100}{7}\).49%
b)\(\dfrac{3}{8}\)+0,125.\(\dfrac{3}{4}\)-\(1\dfrac{1}{4}\)
c)\(\dfrac{-13}{27}\).\(\dfrac{4}{9}\)+\(\dfrac{4}{9}\).\(\dfrac{-14}{27}\)-\(\dfrac{5}{9}\)
d)\(\dfrac{2}{3.7}\)+\(\dfrac{2}{7.11}\)+\(\dfrac{2}{11.15}\)+.....+\(\dfrac{2}{91.95}\)