Question

calculari x+(y+z)+t stiind ca x+y =2,05 si z+t=-4,5

Answer 1

x+y+z+t=2,05+(-4,5)=2,05-4,5=-2,45

Answer 2

$x+y=2,05 \\ z+t=-4,5 \\ x+(y+z)+t=x+y+z+t=2,05-4,05=-2,45$