寒假什么都忘关了唉.1.log4^25+log8^(4/125)=?2.log3^(根号27/3）+2log5^10+log2^0.25+7^1-log7^23.TANA=1/3,求(tan(-a-π）*SIN（π+a))/cos(-a+π/2）*sin(a+π）cos(a-3π/2）2.log3^(根号27/3）+2log5^10+log5^0.25+7^1-log7^2
问题描述：
寒假什么都忘关了唉.
1.log4^25+log8^(4/125)=?
2.log3^(根号27/3）+2log5^10+log2^0.25+7^1-log7^2
3.TANA=1/3,求(tan(-a-π）*SIN（π+a))/cos(-a+π/2）*sin(a+π）cos(a-3π/2）
2.log3^(根号27/3）+2log5^10+log5^0.25+7^1-log7^2
答
1:解;原式=log2^5+log8^4-log8^125
=log2^5+2/3log2^2-log2^5
=2/3log2^2
=2/3
答
1.原式=2/2log2^5+2/3log2^2-3/3log2^5
=log2^5+2/3log2^2-log2^5
=2/3