求这两道高中数学题的答案
发布网友
发布时间:2024-10-12 05:19
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共2个回答
热心网友
时间:2024-10-17 18:57
答:
log2(25)*log3(4)*log5(9)
=[log5(25)/log5(2)]* [log5(4)/log5(3)] * [log5(9)]
=[2 /log5(2)]* [2 log5(2)/log5(3)] * [2log5(3)]
=8
(2)
loga(b)*logb(c)*logc(a)
=loga(b)*[loga(c)/loga(b)]*[loga(a)/loga(c)]
=loga(a)
=1
热心网友
时间:2024-10-17 18:54
1原式=ln25*ln4*ln9/ln2ln3ln5=2ln5*2ln2*2ln3/ln5ln2ln3=8
2原式=lnb*lnc*lna/lna*lnb*lnc=1