Question

(13 supra 5-3 supra 5)-(4 supra 6+7 supra 6-5 supr a 5)+18supra 9=.

Answer 1

(13/5-3/5)-(4/6+7/6-5/5)+18/9=

=10/5-(11/6-1)+2= amplificam 1 cu 6

=2-(11/6-6/6)+2=

=2-5/6+2=

=4-5/6= amplificam 4 cu 6

=24/6-5/6=

=19/6