这两题怎么写 在线等
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6+4√2
=2(3+ 2√2 )
=2(√2 +1)^2
√[6+4√2] =√2 .( √2 +1 )=2 + √2
√[6-4√2] =√2 .( √2 -1 )=2 - √2
log<√2> { √[6+4√2] - √[6-4√2] }
=log<√2> [ (2 +√2) -(2 -√2) ]
=log<√2> (2√2)
=log<√2> (√2)^3
=3
(3)
3^(1+log<3>5) -2^(4+log<2>3) +10^(3lg3) + (1/2)^(log<2>5)
=3.3^(log<3>5) - 16.2^(log<2>3)+ [10^(lg3)]^3 + 2^[log<2>(1/5) ]
=15 - 48 +27 + 1/5
=-6 +1/5
=-29/5
=2(3+ 2√2 )
=2(√2 +1)^2
√[6+4√2] =√2 .( √2 +1 )=2 + √2
√[6-4√2] =√2 .( √2 -1 )=2 - √2
log<√2> { √[6+4√2] - √[6-4√2] }
=log<√2> [ (2 +√2) -(2 -√2) ]
=log<√2> (2√2)
=log<√2> (√2)^3
=3
(3)
3^(1+log<3>5) -2^(4+log<2>3) +10^(3lg3) + (1/2)^(log<2>5)
=3.3^(log<3>5) - 16.2^(log<2>3)+ [10^(lg3)]^3 + 2^[log<2>(1/5) ]
=15 - 48 +27 + 1/5
=-6 +1/5
=-29/5
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