Question

Calculati a² unde a= (3/4 + 5/6 -5/12)· (7/6)$^{-1}$

Answer 1

$\rm a=\Big(^{3)}\frac34+^{2)}\frac56+\frac{5}{12}\Big)*(\frac76)^{-1} \\ \\ a=\Big(\frac{9}{12}+\frac{10}{12}+\frac{5}{12}\Big)*\frac67 \\ \\ a=\frac{24}{12}*\frac67 \\ \\ a=\frac{12}{7} \\ \\ \boxed{\rm a^2=\frac{144}{49}}$