Question

Calculati : a)
12 supra 35 ori 7 supra 6 - 42 supra 55 ori 11 supra 6 + 17 supra 15 - 7 supra 6

Answer 1

12/35 x 7/6 - 42/55 x 11/6 + 17/15 - 7/6=
=2/5 x 1/1 - 7/5 x 1/1 + 17/15 - 7/6=
=2/5- 7/5+ 17/15 - 7/6=
=-5/5+ 17/15 - 7/6=
=-1+ 17/15 - 7/6=
=(-30+34-35)/30=
=-31/30
=-1,0(3)