lg5乘以lg8000 等于多少?

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lg5乘以lg8000 等于多少?
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lg5乘以lg8000 等于多少?
lg5乘以lg8000 等于多少?

lg5乘以lg8000 等于多少?
lg5=1-lg2
lg8000=lg8+3=3lg2+3=3(1+lg2)
lg5·lg8000
=(1-lg2)[3(1+lg2)]
=3-3(lg2)^2