(lg2)^3+2lg2.lg5+(lg5)^3=题目写错了 = = 应该是 :(lg2)^3+3lg2.lg5+(lg5)^3

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(lg2)^3+2lg2.lg5+(lg5)^3=题目写错了 = =  应该是 :(lg2)^3+3lg2.lg5+(lg5)^3

(lg2)^3+2lg2.lg5+(lg5)^3=题目写错了 = = 应该是 :(lg2)^3+3lg2.lg5+(lg5)^3
(lg2)^3+2lg2.lg5+(lg5)^3=
题目写错了 = = 应该是 :(lg2)^3+3lg2.lg5+(lg5)^3

(lg2)^3+2lg2.lg5+(lg5)^3=题目写错了 = = 应该是 :(lg2)^3+3lg2.lg5+(lg5)^3
=(lg2)^3+2lg2.lg5.lg10+(lg5)^3
=(lg2)^3+2lg2.lg5(lg2+lg5)+(lg5)^3
=(lg2+lg5)^3
=1^3=1