求值:log2(cosπ/9)+log2(cos(2π)/9)+log2(cos(4π)/9)log后的2为下标,

求值:log2(cosπ/9)+log2(cos(2π)/9)+log2(cos(4π)/9)log后的2为下标, 9^log2(3) 求值 求值log2^3+log2^√3/log2^9-log2^√3 求值【log2^3+log2^√3/log2^9-log2^√3】-2013^0 求值!log2(cos湃/9)+log2(cos2湃/9)+log2(cos4湃/9)答案是-3,『湃就是3.1415926...』 求值:log2(32)+log2(6)-log2(3/4) log2 27/log2 9= 求值:log8(底数)9/log2(底数)3 (过程） log2(log2 (log2 9)/(log2 8) = 2/3(log2 3) 求值：log2√(7/48)+log2(12)-1/2log2(42)-1 这道题我算来算去算不对 求值,三角函数log2（cos20）+log2（cos40）+log2（cos80） 化解求值（对数,三角函数）速解,log2*cos20`+log2*cos40`+log2*cos80`=? 若a属于【0,π/4】,y=log2(1+cos（9/2π-a）)+log2(1+sin（a-5π）)的值域为 求值：log2 (5/56)^(1/2)+log2 (14)-(1/2)log2 (35)=log2中2为底数=1/2[-2log2 (7)-3]+log2 (2)+log2 (7) 中的1/2[-2log2 (7)-3]是怎么得到的？ log2^9*log3^8 log8(9)*log2(3) 计算：（1）log2 (4^3*8^5);(2)log2 3+log2 6-log2 9