Question

aduceti la forma cea mai simpla expresia -10radical125+2radical108+7radical192-3radical245

Answer 1

  $\sqrt{125}=5\sqrt5\;;\;\sqrt{108}=6\sqrt3\;;\;\sqrt{192}=8\sqrt3\;;\;\sqrt{245}=7\sqrt5\;;$
$-10\cdot5\sqrt5+2\cdot6\sqrt3+7\cdot8\sqrt3-3\cdot7\sqrt5=\;-\,71\sqrt5+68\sqrt3$