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Daca a=3 si b+c+d =30 calculati 3a +2(ab +ac +ad)

Răspuns :

3a = 3 • 3 = 9
ab + ac + ad = a • ( b + c + d ) = 3 • 30 =90
2(ab + ac + ad) = 2 • 90 = 180

3a + 2(ab + ac + ad) = 9 + 180 = 189