Question

1) Calculeaza media aritmetica si media geometrica ,stiind ca :
x=$7 \sqrt{2} +7$
y=$7 \sqrt{2} -7$

2)$A^{2} =31- 12\sqrt{3}$
Calculati A=?

Answer 1

1.
x=7√2+7
y=7√2-7

Mg=√(7√2+7)(7√2-7)=√(98-49)=√49=7

2. A²=31-12√3=27-12√3+4=(3√3)²-2×3√3×2+2²=(3√3-2)²
A=3√3-2