Question

Четвертое и пятое быстрее пожалуйста

Answer 1

4) $sqrt{49*64} = 7 * 8 = 56$
$sqrt{8} * sqrt{50} = sqrt{8*50}= sqrt{400}= 20$
$sqrt{ frac{25}{64} } = frac{5}{8} = 0,625$
5) $2 sqrt{2}+ sqrt{50}- sqrt{98}= 2 sqrt{2}+ sqrt{25*2} - sqrt{49*2}= 2 sqrt{2} +5 sqrt{2}- 7 sqrt{2} = 0$
$( sqrt{3} + sqrt{2} ) ^{2} = ( sqrt{3} ) ^{2} + 2 *sqrt{3} * sqrt{2}+ ( sqrt{2}) ^{2}=3+ 2 sqrt{6} +2= 5 + 2 sqrt{6}$
$0,8* sqrt{225} -0,5* sqrt{1,21} = 0,8*15 - 0,5 *1,1 = 12 - 0,55 = 11,45$