a) -4 +(-2) +3 -(-5+7-9+1)= 3
-4-2+3-(-6) = 3
-4-2+3+6=3
-6+9 = 3
b) -50 +14 +(-7 )= -43
-50+14-7= -43
-57+14 = -43
c) 40-(65-84)= -60
40-(-19)= -60
40+19 = -60
59≠ -60
d) 17+(-2)-(-4)= 20
17-2+4 = 20
19 ≠ 20
e)
16-(-4)-8-(-9)-24 = -3
16+4-8+9-24 = -3
29-32 = -3
f) -7-(2-4) = 10
-7-(-2 )= 10
-5 ≠ 10
