Срочно !!!! Помогите , пожалуйста !!!!

1
$\sqrt{16*25}= \sqrt{4^{2} 5^{2} } =4*5=20 \sqrt{0,36*81}= \sqrt{0,6^{2} 9^{2} } =0,6*9=5,4$
$\sqrt{8} \sqrt{50} = \sqrt{ 2^{2}2 } \sqrt{50}=2\sqrt{2*50} 2 \sqrt{100} =2 \sqrt{ 10^{2} } =2*10=20$
$\sqrt{5} * \sqrt{45}= \sqrt{5} \sqrt{5*9} = \sqrt{ 5^{2} 3^{2} } =5*3=15$
$\sqrt{ \frac{2}{5} } \sqrt{2} \sqrt{ \frac{1}{5}}= \sqrt{\frac{2*2}{5*5}}= \frac{2}{5}$
$\sqrt{ \frac{25}{64} } = \sqrt{ \frac{ 5^{2} }{ 8^{2} } } = \frac{5}{8}$
$\sqrt{2 \frac{14}{25}}= \sqrt{ \frac{2*25+14}{5*5}}= \frac{ \sqrt{64} }{5} = \frac{ \sqrt{ 8^{2} } }{5} = \frac{8}{5}=1 \frac{3}{5}$
$\frac{ \sqrt{3}}{ \sqrt{48}}= \sqrt{ \frac{3}{3*16} } = \sqrt{ \frac{1}{ 4^{2} } } = \frac{1}{4}$
$\frac{ \sqrt{7,2}}{ \sqrt{0,2}}= \sqrt{ \frac{72}{10}: \frac{2}{10}} = \sqrt{ \frac{72}{2}}= \sqrt{36}= \sqrt{ 6^{2} } =6$
2
√45=√9*√5=3√5
√75=√25*√3=5√3
0,1√300=0,1√100√3=0,1*10√3=√3
3
3√11=√9*√11=√99
-10√5=-√100√5=-√500