Помогите решить плиз 1)3√300-7√75+√27-5√108+√6 2)-5√5(√125-1/√5+2√20...

$1) .......=3 \sqrt{3*100} -7 \sqrt{3*25} + \sqrt{3*9} -5 \sqrt{3*36}+ \sqrt{6} =$ $30 \sqrt{3} -35 \sqrt{3}-3 \sqrt{3} -30 \sqrt{3}+ \sqrt{3 } \sqrt{2} = -38 \sqrt{3}+ \sqrt{3} \sqrt{2} =$ $- \sqrt{3} *(38- \sqrt{2})$

2. ......... $=-5 \sqrt{5} * \frac{ \sqrt{125}-1 }{ \sqrt{5}+2 \sqrt{20} } =-5 \sqrt{5}* \frac{5 \sqrt{5}-1 }{ \sqrt{5}(1+2 \sqrt{4} ) } = -5 \sqrt{5} * \frac{5 \sqrt{5}-1 }{5 \sqrt{5} } =-5 \sqrt{5}-1$

3. ....... $=4*3+ \frac{9*3}{5}-6+ \frac{4}{15}=12+5 \frac{2}{5}-6+ \frac{4}{15} =6+5 \frac{10}{15}=11 \frac{2}{3}$