发布网友 发布时间:2023-04-04 12:06
共1个回答
热心网友 时间:2024-12-07 09:06
=log2 3^2=log2 9
1.261859507
2log以5为底25的对数-3log以2为底64的对数
=2×log以5为底5²的对数-3×log以2为底2的6次方的对数
=2×2-3×6
=4-18
=-14
这是最简了,不能化简
如果求近似值
则=2lg7/lg2约等于3.54
2Log[5,10] + Log[5,0.25]
= 2(1+ Log[5,2] ) + Log[5,1/4]
= 2 + 2Log[5,2] - 2Log[5,2]
= 2
a=log(3)2
log(3)8-2log(3)6=3log(3)2-2[log(3)2+log(3)3]=3a-2(a+1)=a-2
2log25[10]+log25[0.25]
=log25[10²]+log25[0.25]
=log25[10²×0.25]
=log25[25]
=1
1/2log4(8)-log4(√2)
=log4(√8)-log4(√2)
=log4(√8/√2)
=log4(√4)
= 1/2
2log以a为底(M-2N)的对数=log以a为底M的对数+log以a为底N的对数
log以a为底(M-2N)²的对数=log以a为底(MN)的对数
(M-2N)²=MN
M²-4MN+4N²=MN
M²-5MN+4N²=0
(M-N)(M-4N)=0
M-N=0 或 M-4N=0
M=N 或 M=4N
∵ 真数M-2N﹥0
∴M﹥2N ,M=N不合题意,应该舍去
∴M=4N
M/N=4N/N=4