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daca a,b,c apartin lui N si ab+ac=715,calculati 18a(5b+5c)

Răspuns :

a(b+c)=715
18a*5(b+c)=90*715=64350
ab+ac=715
a(b+c)=715
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18a(5b+5c)=18*5*a(b+c)=18*5*715=64350