Câu 1 Tính:
a. M= \(\frac{363636.37-373737.36}{1+2+3+...+2013}\)
b, B= (\(\frac{1}{11}+\frac{1}{21}+\frac{1}{31}+\frac{1}{41}+\frac{1}{51}\)) x (\(\frac{123}{738}-\frac{1342}{2013}-\frac{-1007}{2014}\))
c, D= \(\frac{12}{6.7}+\frac{12}{7.22}+\frac{12}{22.15}+\frac{12}{15.38}+...+\frac{12}{97.202}\)