Tính. 5/18 + 12/7

a) $\frac{5}{28}+\frac{12}{7}=$……………………………

c) $\frac{23}{24}-\frac{5}{6}=$……………................

b) $4+\frac{7}{12}=$………………………………

d) $\frac{64}{19}-3=$………………………………

a) $\frac{5}{28}+\frac{12}{7}=\frac{5}{28}+\frac{48}{28}=\frac{53}{28}$

c) $\frac{23}{24}-\frac{5}{6}=\frac{23}{24}-\frac{20}{24}=\frac{3}{24}$

b) $4+\frac{7}{12}=\frac{48}{12}+\frac{7}{12}=\frac{55}{12}$

d) $\frac{64}{19}-3=\frac{64}{19}-\frac{57}{19}=\frac{7}{19}$