a)1
intreg 1/4-2/7+3 intregi 1/2- 3/14 =
=5/4-2/7+7/2-3/14=
=(35-8+98-6)/28=
=119/28=
=17/4
b)13/18-2/9 +2
intregi si 1/4- 1 intreg si 1/6 =
=13/18-2/9 +9/4-7/6 =
=(26-8 +81-42)/36 =
=57/36 =
=19/12
c) 3 intregi+2/5- 7/12-1 intreg si 8/15 =
=3+2/5- 7/12-23/15 =
=(180+24-35-92)/60 =
=77/60
d) 1 intreg 1/2 -5/18-8/27+ 2
intregi si 2/9=
=3/2 -5/18-8/27+ 20/9=
=(81-15-16+120)/54=
=170/54=
=85/27