log2(4^7*2^5)
log2 5/4+log2 5
根号下{[log2 (5)]^2-4log2(5)+4}+log2(1/5)
log2 SQR(7/48)+log2 12 -1/2log2 48
log2 SQR(7/48)+log2 12 -1/2log2 42
(log3 4+log3 8)(log2 3+log2 9)+(log3 根号2)(log9 7)/(log1/3 7)
4的1/2(log2底9-log2底5)的次方等于多少?
log2(20)-log2(5)+2log3(2)×log4(3)
解不等式2log2 (x-4)< log2 (x-2)
(log3^4+log5^2)(log2^9+log2^根号3)
1/2log2(7/48)+log2 12-1/2log2 42
log2(根号下7/48)+log2(12)-1/2log2(42)-1=?
Log2√(7/48) +log2 12 -(1/2)log2 42