А)√121 - 10√ 6,4 * √0.1б)2√5 - √45 + √80в)2√2 * (√8 - √32)

1) [latex]\sqrt{121}-10\sqrt{6,4}*\sqrt{0,1}= \\ \\=11-\sqrt{100*6,4*0,1}= \\ \\=11-\sqrt{64}=11-8=3[/latex]     2) [latex]2\sqrt{5}-\sqrt{45}+\sqrt{80}=2\sqrt{5}-\sqrt{5*9}+\sqrt{16*5}= \\ \\=2\sqrt{5}-3\sqrt{5}+4\sqrt{5}=3\sqrt{5}[/latex]     3) [latex]2\sqrt{2}*(\sqrt{8}-\sqrt{32})=2\sqrt{2*8}-2\sqrt{2*32}= \\ \\=2\sqrt{16}-2\sqrt{64}=2*4-2*8=8-16=-8[/latex]