计算:三次根号(7-5根号2)+三次根号(7+5根号2)
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三次根号(7-5根号2)+三次根号(7+5根号2)
=三次根号[(1-√2)三次方]+三次根号[(1+√2)三次方]
=(1-√2)+(1+√2)
=2
=三次根号[(1-√2)三次方]+三次根号[(1+√2)三次方]
=(1-√2)+(1+√2)
=2
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三次根号(7-5根号2)+三次根号(7+5根号2)
(7-5*2^(1/2))^(1/3)+(7+5*2^(1/2))^(1/3)
=(1-2^(1/2))^3^(1/3)+(1+2^(1/2))^3^(1/3)
=1-2^(1/2)+1+2^(1/2)
=2
(7-5*2^(1/2))^(1/3)+(7+5*2^(1/2))^(1/3)
=(1-2^(1/2))^3^(1/3)+(1+2^(1/2))^3^(1/3)
=1-2^(1/2)+1+2^(1/2)
=2
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