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b-c = 31 si a x b - a x c =138 calculati a

Răspuns :

b-c=31
a*b-a*c=138
a(b-c)=138
a*31=138
a=138:31
a=4,4516
a×b - a×c=138
b-c=31
Dăm factor comun:
a (b-c)=138
a×31=138
a=138÷31