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A+B+C=840
A+B=642
B+C=553
A,B,C=?


Răspuns :

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

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

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

287+b=642
b=642-287
b=355

Verificare : 287+355+198=840
C=840-642=128
A=840-553=287
B=840-(128+287)=155