2) √(98/(176² - 112²)) = √(98/(176 - 112)(176+112)) = √(98*64*288) =
= √(2*49*64*2*144) = 2*7*8*12 =1344
4) √(145,5² - 96,5²)/ (193,5² - 31,5²) = √(145,5 - 96,5)(145,5 + 96,5) /(193,5 -
- 31,5)(193,5 + 31,5) = √49*242*162*225 = √49*2*121*2*81*225 =
= 7*2*11*9*15 = 20790