-9+(-0,3)=-9-0,3=-9,3;
-6,7+(-5)=-6,7-5=-11,7;
-3+(-0,91)=-3-0,91=-3,91;
-6,03+(-2,17)=-6,03-2,17=-8,2;
-7,2+(-8,23)=-7,2-8,23=-15,43;
-4,5+(-27,8)=-4,5-27,8=32,3;
-9,5+(-100)=-9,5-100=-109,5;
-5,07+(-61,9)=-5,07-61,9=66,97;
-21,61+(-45,7)=-21,61-45,7=67,31