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(a+b)³= a³+b³+3ab(a+b)
Datos:
a+b= 5 y ab = 6
Solucion:
a+b=5 (elevamos al cubo)
a³+b³+3ab(a+b)= 125 tenemos ab = 6 y tenemos a+b = 5
a³+b³+ 3(6)(5) = 125
a³+b³= 125 - 90
a³+b³= 35