Tính:
a)\(\frac{3}{5}+\left(\frac{-4}{3}\right)+\left(\frac{-3}{4}\right)\)
b) \(\frac{5}{8}-\left(\frac{-2}{5}\right)-\frac{3}{10}\)
c) \(\left(\frac{-7}{2}\right)+\left(\frac{-2}{3}\right)+\left(\frac{-3}{5}\right)\)
d) \(\frac{3}{4}-[\left(\frac{-5}{3}\right)-\left(\frac{1}{12}+\frac{2}{9}\right)]\)