A\(\frac{7}{15}+\frac{4}{5}=\frac{7}{15}+\frac{12}{15}=\frac{19}{15}\)
B\(\frac{2}{3}-\frac{3}{8}=\frac{16}{24}-\frac{9}{24}=\frac{7}{24}\)
C\(\frac{4}{5}\times\frac{5}{8}=\frac{20}{40}=\frac{1}{2}\)
D\(4:\frac{3}{2}=\frac{4}{1}\times\frac{2}{3}=\frac{8}{3}\)