Срочно, помогите 336(1,4)

№336, 1)

$2\sqrt{3}(\sqrt{12}+3\sqrt{5})-\sqrt{5}(6\sqrt{3}-\sqrt{20})=\\2\sqrt{3*12}+2*3\sqrt{3*5}-6\sqrt{5*3}+\sqrt{5*20}=\\2\sqrt{36}+6\sqrt{15}-6\sqrt{15}+\sqrt{100}=2*6+10=2(6+5)=22$

№336, 2)

$(17-\sqrt{21})^2-5\sqrt{3}(4\sqrt{27}-6,8\sqrt{7})=\\17^2-2*17*\sqrt{21}+(\sqrt{21})^2-5*4\sqrt{3*27}+5*6,8\sqrt{3*7}=\\289-34\sqrt{21}+21-20\sqrt{81}+34\sqrt{21}=310-20*9=130$