Question

если 40% числа равны

Answer 1

 $\sqrt{(9-2 \sqrt{23} )^{2}} =|9-2 \sqrt{23} |=2 \sqrt{23} -9 \\ \sqrt{(9+2 \sqrt{23} )^{2}} =|9+2 \sqrt{23} |=9+2 \sqrt{23} \\ \sqrt{(9-2 \sqrt{23} )^{2}}+\sqrt{(9+2 \sqrt{23} )^{2}}=2 \sqrt{23} -9+9+2 \sqrt{23}=4 \sqrt{23} \\ 4\sqrt{23}*5/2= 10\sqrt{23}$