-11/12+7/8= aflam numitorul comun astefel
12=2²x3
8=2³
[12,8]=2³x3=24 este numitorul comun
24:12=2 deci cu 2 amplificam I fractie
24:8=3 deci cu 3 amplificam II fractie
=(-11x2+7x3)/24=(-22+21)/24=-1/24
6intreg si 5/8+1 intreg si 7/12=
(6x8+5)/8+(1x12+7)/12=
53/8+19/12=
(53x3+19x2)/24=
(159+38)/24=197/24
(-5/16)x8/25=-(5x8)/(16x25)=-1/10