Question

fie nr reale a=√7-√2 si b=√7+√2. Calculati media aritmetica a numerelor a si b; calculati val numarului (a-b) la patrat

Answer 1

 Ma=(√7-√2+√7+√2)/2 => Ma=2√7/2 =>Ma=√7(a-b)^2 = (√7-√2-√7-√2)^2=0^2=0

Answer 2

Media aritmetica = $\frac{a+b}{2} = \frac{ \sqrt{7}- \sqrt{2} + \sqrt{7}+ \sqrt{2} } {2} = \frac{2 \sqrt{7} }{2} = \sqrt{7}$

(a-b)^2=$( \sqrt{7} - \sqrt{2} - \sqrt{7} + \sqrt{2} ) ^{2} = 0 ^{2} =0$