高中数学问题谢谢
3个回答
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(2)
[(3-π)^4]^(1/4) = π-3
ans: B
(3)
log<2>[log<2>(log<2>16) ]
=log<2>[log<2>4 ]
=log<2>2
=1
ans:B
(4)
cos2x = 2(cosx)^2 -1
cosx =√ [(1+cos2x)/2]
cos15°
= √[( 1+ cos30°)/2]
= √[( 1+ √3/2)/2]
= √[( 2+ √3)/4]
= √[( 4+ √3)/8]
=(√3 +1)/(2√2)
=(√6 +√2)/4
ans : A
[(3-π)^4]^(1/4) = π-3
ans: B
(3)
log<2>[log<2>(log<2>16) ]
=log<2>[log<2>4 ]
=log<2>2
=1
ans:B
(4)
cos2x = 2(cosx)^2 -1
cosx =√ [(1+cos2x)/2]
cos15°
= √[( 1+ cos30°)/2]
= √[( 1+ √3/2)/2]
= √[( 2+ √3)/4]
= √[( 4+ √3)/8]
=(√3 +1)/(2√2)
=(√6 +√2)/4
ans : A
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