求值:(lg2)^3+3(lg2)^2*lg5+3lg2*(lg5)^2+(lg5)^3
问题描述:
求值:(lg2)^3+3(lg2)^2*lg5+3lg2*(lg5)^2+(lg5)^3
答
和立方公式
(lg2)^3+3(lg2)^2*lg5+3lg2*(lg5)^2+(lg5)^3
=[lg2+lg5]^3
=(lg10)^3
=1