Представьте в виде квадрата двучлена трехчлены

1)
$\frac{4}{9} + \frac{4}{3}a + {a}^{2} = {( \frac{2}{3} + a)}^{2}$
2)
$\frac{9}{25} + \frac{6}{5}b + {b}^{2} = {( \frac{3}{5} + b)}^{2}$
3)
$\frac{16}{49} + \frac{8}{7}c + {c}^{2} = {( \frac{4}{7} + c)}^{2}$
4)
$\frac{100}{121} {k}^{2} - \frac{20}{11}tk + {t}^{2} = {( \frac{10}{11}k - t)}^{2}$
5)
${m}^{2} - \frac{22}{13}mn + \frac{121}{169} {n}^{2} = {(m - \frac{11}{13}n)}^{2}$
6)
$\frac{400}{441} {t}^{2} + \frac{40}{21}nt + {n}^{2} = {( \frac{20}{21}t + n)}^{2}$