Question

Calculati:
(0.5-0.72)*(0.5la puterea 2 +0.5*0.72+0.72la puterea 2 )+0.72 la puterea 3
P.S. Vreau si rezolvarea nu doar rezultatul , dau coroita

Answer 1

folosim formula a³-b³=(a-b)(a²+ab+b²)
unde a=0,5  si b=0,72

(0.5-0.72)*(0.5² +0.5*0.72+0.72²)+0.72³=
=0,5³-0,72³+0,72³=0,5³=0,125