Question

помогите пожалуйстаа​

Answer 1

$1)0,2\sqrt{72}*(-\sqrt{2}) = - 0,2*6\sqrt{2}\sqrt{2}=-0,2*6*2=-2,4=-\frac{12}{5}=-2\frac{2}{5}\\2) 5\sqrt{81}-(-\sqrt{5})^{2}=5*9-\sqrt{5}^{2}=45-5=40$