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axb+axc=135 si a=9 aflati b+c

Răspuns :

9×b+9×c=135
2a+b+c=135
18+b+c=135
b+c=117
a=9
a×b+a×c=135
9×b+9×c=135
9(b+c)=135
b+c=135÷9
b+c=15