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a fost răspuns

Afla suma numerelor a b si c stiind ca:
2a+b+c=142. a+2b+c=144. a+b+2c=144

Răspuns :

Toadermunteanu820
2a+b+c+a+2b+c+a+b+2c=4a+4b+4c=142+144+144=430⇔4(a+b+c)=430⇔a+b+c=107,5⇔
a=142-107,5⇔a=34.5.

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