-9+(-0.3)= -9.3
-6.7+(-5)= -11.7
-3+(-0.91)=-3.91
-6.03+(-2.17)= -8.2
-7.2+(-8.23)= -15.43
-4.5+(-27.8)= -32.3
-9.5+(-100)= -109.5
-5.07+(-61.9)= -66.97
-21.61+(-45.7)= -67.31
-9+(-0.3)= -9.3
-6.7+(-5)= -11.7
-3+(-0.91)=-3.91
-6.03+(-2.17)= -8.2
-7.2+(-8.23)= -15.43
-4.5+(-27.8)= -32.3
-9.5+(-100)= -109.5
-5.07+(-61.9)= -66.97
-21.61+(-45.7)= -67.31
-6,7-5=-11,7
-3-0,91=-3,91
2) -6,03-2,17=-8,20
-7,2-8,23=-15,43
-4,5-27,8=-32,3
3) -9,5-100=-109,5
-5,07-61,9=-66,97
-21,61-45,70=-67,31