利用loga(b)=1/logb(a)
p=1/log2(11)+1/log3(11)+1/log4(11)+1/log5(11)
=log11(2)+log11(2)+log11(2)+log11(5)
=log11(2*3*4*5)
=log11(120)
11<120<121=11^2
1
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