Ответ:

  1. \[\sqrt{0,87\cdot49+0,82\cdot49}=\sqrt{49(0,87+0,82)}=\sqrt{49\cdot1,69}=7\cdot1,3=9,1.\]
  2. \[\sqrt{1,44\cdot1,21-1,44\cdot0,4}=\sqrt{1,44(1,21-0,4)}=\sqrt{1,44\cdot0,81}=1,2\cdot0,9=1,08.\]

Жауабы: 1) 9,1; 2) 1,08.