Question

Calculati x-y+z-t daca x=2-3+5 y=-3+2-1 z=-5+2-9 t=1-2-3-4

Answer 1

x = 2-3+5 = 4
y = -3+2-1 = -2
z= -5+2-9 = -12
t = 1-2-3-4 = -8

x-y+z-t = 4-(-2)+(-12)-(-8) = 4+2-12+8 = 2

Answer 2

x - y + z - t = 2 - 3 + 5 
                     3 - 2 +1
                    -5 +2 - 9
                    -1 +2 +3 +4
                -----------------------
             =  - 1  -1 +0 +4 = -2+4= +2