求解答,需要过程。。
2个回答
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解答:
1 原式=sin(10π-26π/3)-cos(29π/6-4π)-tan(25π/4-6π)
=sin(4π/3)-cos(5π/6)-tan(π/6)
=-根号(3)/2 -(-根号(3)/2)-根号(3)/3
=-根号(3)/3
2
原式=根号(3)x(三次根(3)/三次根(2))x(六次根(4)x六次根(3))+(lg(3)/lg(4)+lg(3)/lg(8))x(lg(2)/lg(3))
=根号(3)x(三次根(3)/三次根(2))x三次根(2)x六次根(3)+((1/2+1/3)lg3/lg2)xlg2/lg3
=3^(1/2+1/3+1/6)x2^(-1/3+1/3)+5/6
=3+5/6=23/6
1 原式=sin(10π-26π/3)-cos(29π/6-4π)-tan(25π/4-6π)
=sin(4π/3)-cos(5π/6)-tan(π/6)
=-根号(3)/2 -(-根号(3)/2)-根号(3)/3
=-根号(3)/3
2
原式=根号(3)x(三次根(3)/三次根(2))x(六次根(4)x六次根(3))+(lg(3)/lg(4)+lg(3)/lg(8))x(lg(2)/lg(3))
=根号(3)x(三次根(3)/三次根(2))x三次根(2)x六次根(3)+((1/2+1/3)lg3/lg2)xlg2/lg3
=3^(1/2+1/3+1/6)x2^(-1/3+1/3)+5/6
=3+5/6=23/6
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