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B) -14
C) 130
D) -1
E) -12
A)20-14=6
B)36-50=-14
C)100-(-30)=100+30=>130
D)(-40)-100=-40-100=>-140
E) -4-(-5)=-4+5=>1
F) -20-(-8) ==>-20+8=>-12
Espero ayude