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x+y=1540,x=z=699 calculeaza y-z

Răspuns :

y=1540-699(x)=841
Raspuns:y=841
x+y=1540
x=z=699
y-z=?
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inlocuim in prima ecuatie si avem:
699+y=1540=>y=1540-699=>y=841
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Acum ca stim atat y cat si z,putem afla y-z
y-z<=>841-699=142