Question

Efectuati:
[9/10-1/13 x (25/12-17/20-12/15)] x 15/13
5/72:[17/12+3/14 x (25/6+5/18-51/12

Answer 1

[9/10-1/13 x (25/12-17/20-12/15)] x 15/13 =
=[9/10-1/13 x (125-51-48)/60)] x 15/13 =
=(9/10-1/13 x 26/60) x 15/13 =
=(9/10-1/13 x 13/30) x 15/13 =
=(9/10-1/30) x 15/13 =
=(27-1)/30 x 15/13 =
=26/2 x 1/13 =
=13x1/13=
=1

5/72:[17/12+3/14 x (25/6+5/18-51/12)]=
=5/72:[17/12+3/14 x (150+10-153/36)]=
=5/72:(17/12+3/14 x 7/36)=
=5/72:(17/12+1/2 x 1/12)=
=5/72:(17/12+1/24)=
=5/72:(34+1)/24=
=5/72:35/24=
=5/72 ×24/35=
=1/6 ×2/7=
=2/42=
=1/21