Question

help me, помогите ))))))))

Answer 1

$a)0,25* sqrt{128} =0,25*8 sqrt{2} =2 sqrt{2}$
$B)5-12* sqrt{ frac{25}{64} } =5-12 * frac{5}{8} =5-3* frac{5}{2} =5- frac{15}{2} =- frac{5}{2} =-2 frac{1}{2} =-2,5$