bài 1:
a,\(\frac{3}{5}\)+\(\frac{4}{15}\)
b,\(\frac{-3}{5}\)+\(\frac{5}{7}\)
c,\(\frac{5}{6}\):\(\frac{-7}{12}\)
d,\(\frac{-21}{24}\):\(\frac{-14}{8}\)
e,\(\frac{-3}{5}\).\(\frac{5}{7}\)+\(\frac{-3}{5}\).\(\frac{3}{7}\)+\(\frac{-3}{5}\).\(\frac{6}{7}\)
f,\(\frac{1}{3}\).\(\frac{4}{5}\)+\(\frac{1}{3}\).\(\frac{6}{5}\)-\(\frac{4}{3}\)
g,\(\frac{4}{19}\).\(\frac{-3}{7}\)+\(\frac{-3}{7}\).\(\frac{5}{19}\)+\(\frac{5}{7}\)
h,\(\frac{5}{9}\).\(\frac{7}{13}\)+\(\frac{5}{9}\).\(\frac{9}{13}\)-\(\frac{5}{9}\).\(\frac{3}{13}\)
mn ơi,giúp mk bài này với ạ,mk đag cần gấp