Question

пожалуйста помогитеекее

Answer 1

▪В80.

$( sqrt{8} - 2 sqrt{5} )( sqrt{2} + sqrt[6]{20} )(2 - 2 times sqrt[6]{2.5} + sqrt[3]{20} ) = (2 sqrt{2} - 2 sqrt{5} )( sqrt{2} + sqrt[6]{20} )(2 - 2 times sqrt[6]{ frac{5}{2} } + sqrt[3]{20} ) = (2 sqrt{2} - 2 sqrt{5} )( {( sqrt{2} )}^{3} + {( sqrt[6]{20} )}^{3} = (2 sqrt{2} - 2 sqrt{5} )( 2sqrt{2} + sqrt{20} ) = (2 sqrt{2} - 2 sqrt{5} )( 2sqrt{2} + 2 sqrt{5} ) = {(2 sqrt{2} )}^{2} - {(2 sqrt{5}) }^{2} = 4 times 2 - 4 times 5 = 8 - 20 = - 12$
▪В81.

$( sqrt{27} + 3 sqrt{2} )( sqrt{3} - sqrt[6]{18} )(3 + 3 times sqrt[6]{ frac{2}{3} } + sqrt[3]{18} ) = (3 sqrt{3} + 3 sqrt{2} )( {( sqrt{3} )}^{3} - {( sqrt[6]{18} )}^{3} ) = (3 sqrt{3} + 3 sqrt{2} )(3 sqrt{3} - sqrt{18} ) = (3 sqrt{3} + 3 sqrt{2} )(3 sqrt{3} - 3sqrt{2} ) = {(3 sqrt{3}) }^{2} - {(3 sqrt{2}) }^{2} = 9 times 3 - 9 times 2 = 27 - 18 = 9$