Thực hiện phép tính

a)$\frac{4}{13}+\frac{-11}{5}+\frac{9}{13}+\frac{6}{5}$

b)$\left(\frac{1}{2}\times 1\frac{1}{3}-1,25\times \frac{8}{3}\right)÷4$

c)$\frac{21}{2}÷\left(-1\frac{3}{4}\right)+{\left(-\frac{1}{2}\right)}^2$​

d)$\frac{5}{12}+\frac{-9}{17}-\frac{-7}{12}+\left|-\frac{1}{2}\right|+\frac{-8}{17}$​