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X+y+z=800, x+y=600,y+z=540. Aflati valoarea fiecarui numar.

Răspuns :

x+y+z=800
x+y=600
z=800-600=200
y=540-200=340
x=600-340=260

Daca x+y=600 atunci
z=800-600=200

Daca y+z=540 atunci
x=800-540=260

Daca x+z=200+260atunci
y=800-(200+260)=340