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daca 3a+2b+4c=494 si b+2c=160,calculati a si ab+2ac. va rog mult!!!urgeeenttttttttt

Răspuns :

2b+4c=2(b+c)=160
3a=334
a=?
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3a+2(B+2c)=494. 3a+2*160=494. 3a+320=494. 3a=174. A=58. ab+2ac=a(b+2c)=58*160=9280

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