(lg2)3+(lg5)3+lg5·lg8括号外的数字为次方
2个回答
(lg2)3+(lg5)3+lg5·lg8
=(lg2+lg5)[lg^22-lg2*lg5+lg^25]+3lg2*lg5
=lg^22+2lg2*lg5+lg^25
=(lg2+lg5)^2
=1
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