Răspunsuri

  • Utilizator Brainly
2014-02-18T20:54:14+02:00
2a+b-3c=15
a-4b+8c=25/*3 ⇒ 3a-12b+24c=75
Se aduna cele 2 expresii ⇒ 2a+b-3c+3a-12b+24c=5a-11b+21c=15+75=90
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