lg8+3lg5的值?
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lg8+3lg5的值?
lg8+3lg5的值?
lg8+3lg5的值?
3
lg8+3lg5=lg8+lg5^3=lg8+lg125=lg(8×125)=lg1000=3
lg8+3lg5
= lg2³+3lg5
= 3lg2+3lg5
= 3(lg2+lg5)
= 3lg10
= 3