Question

-9 supra 20 -(-11supra20-5supra6)= va rog ajutatima , alt fel nu puteam scrii va rog

Answer 1

9/20-(11/20-5/6)=
Amplificam 11/20 si 9/20 cu 3 si 5/6 amplificam cu 10
=> 27/60-(33/60-50/60)=
27/60-(-17/60)=
10/60=1/6

Answer 2

              
$-\frac{9}{20}(- \frac{11}{20} - \frac{5}{6})= \\ \\ = -\frac{9}{20}(- ^{3)}\frac{11}{20} - ^{10)}\frac{5}{6})= \\ \\ = -\frac{9}{20}(- \frac{33}{60} - \frac{50}{60})= \\ \\ =(-\frac{9}{20})*(- \frac{83}{60})=\frac{9*83}{20*60}=\frac{3*83}{20*20}=\frac{249}{400}$