Question

Media aritmetica : a= 8 - 3(radical 7) + 1supra2 (3+ radical 7) la puterea a 2a si b=24

Answer 1

a=8-3√7+1/2(3+√7)²  -->faci formula de calcul prescurtat
a=8-3√7+1/2(9+6√7+7)
a=8-3√7+1/2(16+6√7) -->imparti la 2;de la 1/2
a=8-3√7+8+3√7
a=16
 Ma=a+b/2
 Ma=16+24/2
     =40/2
     =20

Answer 2

a =8 - 3√7 + 1/2 ·1/(16+6√7) = 8 - 3√7 + 1/4(8 + 3√7) = 8 - 3√7 +( 8-3√7)/4 =
= 3(8 - 3√7) /4
M = (6 - 9√7 /4 + 24)·1/2 = (30 - 9·√7 / 4) /2 = 15 - 9√7 /8  = 3(5 - 3√7 /8)