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(lg2)^3+(lg5)^3+3lg5*lg2怎么算谢谢!
题目详情
(lg2)^3+(lg5)^3+3lg5*lg2怎么算谢谢!
▼优质解答
答案和解析
a³+b³=(a+b)(a²-ab+b²)
(lg2)^3+(lg5)^3+3lg5*lg2
=(lg2+lg5)[(lg2)²-lg2*lg5+(lg5)²]+3lg2*lg5
=(lg10)[(lg2)²-lg2*lg5+(lg5)²]+3lg2*lg5
=(lg2)²-lg2*lg5+(lg5)²+3lg2*lg5
=(lg2)²+2lg2*lg5+(lg5)²
=(lg2+lg5)²
=(lg10)²
=1²
=1
(lg2)^3+(lg5)^3+3lg5*lg2
=(lg2+lg5)[(lg2)²-lg2*lg5+(lg5)²]+3lg2*lg5
=(lg10)[(lg2)²-lg2*lg5+(lg5)²]+3lg2*lg5
=(lg2)²-lg2*lg5+(lg5)²+3lg2*lg5
=(lg2)²+2lg2*lg5+(lg5)²
=(lg2+lg5)²
=(lg10)²
=1²
=1
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