Question

calcule x-y
a)x=+6 e y =+5
b)x=-7 e y =+8
c)x=-9 e y=-5
d)x=+12 e y=-15
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Answer 1

a) +6-(+5)= 6-5=+1

b) -7-(+8)= -7-8= -15

c) -9-(-5)= -9+5= -4

d) +12-(-15)= 12 + 15= +27