Question

rút gọn x=23(5-căn 2 )phần 5+ căn 2

Answer 1

=\(\frac{23\left(5-\sqrt{2}\right)^2}{\left(5-\sqrt{2}\right)\left(5+\sqrt{2}\right)}\)

=\(\frac{23\left(25-10\sqrt{2}+2\right)}{25-2}\)

=\(\frac{23\left(27-10\sqrt{2}\right)}{23}\)

=\(27-10\sqrt{2}\)