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stiind ca x-y = -2 si z=5 ,calculeaza xz-yz

Răspuns :

x-y=-2
y=x+2
x=-2+y
xz-yz=(-2+y)*5-(x+2)*5=-10+5y-5x+10=5y-5x=5y-5*(-2+y)=5y+10-5y=10
(coroana pls)