Question

Sendo X = -4-(5-7)
Y= 2+(9-16) e Z= -5-(-2-4) calcule o valor de:

A) X-Y-Z

B) Y-(X-Z)

C) Z+(-X-Y)


D) ( X-Y)-(Z-X)

Answer 1

X = -4-(5-7)= -4-(-2)= -4+2=-2
Y= 2+(9-16)= 2+(-7)=2-7=-5
 e Z= -5-(-2-4)= -5-(-6)=-5+6= 1 
A) X-Y-Z= -2-(-5)-1= -2+5-1= 3-1=2

B) Y-(X-Z) = -5-(-2-1)= -5-(-3)= -5+3=-2

C) Z+(-X-Y)= 1+(-2-(-5))= 1+ (-2+5)= 1+(3)= 1+3=4


D) ( X-Y)-(Z-X)=(-2-(-5))-(1-(-2))=(-2+5)-(1+2)= 3-3=0