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a+b+c =840
a+b=642
b+c=553
a,b,c=?


Răspuns :

(a+b)+c=840
642+c=840 => c=840-642=198
a+(b+c)=840
a+553=840 => a=840-553=287
287+b=642 => b=642-287=355

a+b+c=840
a+b=642
b+c=553

c+642=840
c=840-642
c=198

a+553=840
a=840-553
a=287

198+287+b=840
485+b=840
b=840-485
b=355

c=198;a=287;b=355     Sper ca te-am ajutat!