求值：log2√(7/48)+log2(12)-1/2log2(42)-1 这道题我算来算去算不对

求值：log2√(7/48)+log2(12)-1/2log2(42)-1 这道题我算来算去算不对 log2[√(7/48)]+log2(12)-log2(√42) 求值log2^3+log2^√3/log2^9-log2^√3 求值【log2^3+log2^√3/log2^9-log2^√3】-2013^0 化简算式log2^√7/48+log2^12-1/2log2^42+1/2^log2^3 计算log2 √(48/7)-log2 12+(1/2)log2 42-1 log2 SQR(7/48)+log2 12 -1/2log2 48 log2 SQR(7/48)+log2 12 -1/2log2 42 9^log2(3) 求值 log2 √7/24+log2 12-log442 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？ 求值:log2(32)+log2(6)-log2(3/4) Log2√（7/48） +log2 12 -（1/2）log2 42要详细点的额 1/log5^7+1/log3^7+1/log2^7 ,求值 log2(log2 1/2log2(7/48)+log2 12-1/2log2 42log2 的2 在g的右下脚 log2底√1/48+log2底12-1/2log2底24等于? log2（√1/48）+log2 12-1/2log2 （24）-1/3