Question

√(0,81*625)-√(2 14 )

Answer 1

$sqrt{0.81*625}-sqrt{2frac{1}{4}}=sqrt{0.9^2*25^2}-sqrt{frac{9}{4}}=0.9*25-sqrt{frac{3^2}{2^2}}=\=22.5-frac{3}{2}=21$