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a fost răspuns

Daca 3a+2b+4c egal 494
b+2c egal 160
calculati a si ab+2ac

Răspuns :

3a+2b+4c=494
b+2c=160
3a+2×(b+2c)=494
3a+2×160=494
3a+320=494
3a=174
a=174:3
a=58
ab+2ac .. dai factor comun a:
a×(b+2c)=
58×160=9280

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