题目没问题?貌似只看过这类的：(lg2)^3+(lg5)^3+3lg5*lg2a³+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...