Question

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Calculati (a+b)+c daca a=+17 si b+c=-37

Calculati numerele c,d,e f unde c=a+b d=a-b e=c+d
f=c-d
stiind ca:1)a=+6,b=+3 2)a=+4,b=-7 3)a=+5,b=-3 4)a=-7,b=-10
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Answer 1

(a+b)+c=a+(b+c)=17+(-37)=-20