Question

12.calculati,folosind distributivitatea inmultirii fata de adunare si scadere:d)14 supra 9×27 supra 32-15 supra 28;e)15 supra 8×6 supra 25+16 supra 45,dau coroana!

Answer 1

14/9×(27/32-15/28)=
=14/9×27/32-14/9×15/28=
=7/1×3/16-1/3×5/2=
=21/16-5/6=
=(63-40)/48=
=23/48=
=0,4791(6)

e)15/8×(6/25+16/45)=
=15/8×6/25+15/8×16/45=
=3/4×3/5+1/1×2/3=
=9/20+2/3=
=(27+40)/60=
=67/60=1,11(6)