A_A 10分嫁 maths~－貨運百科

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A_A 10分嫁 maths~

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A_A 10分嫁 maths~ http://i164.photobucket.com/albums/u4/ming21ki/MATHS-1.jpg

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23. 答:2 解: (log(x^2))/(log x) =(2log x)/(log x) =2 24. 答:1/2 解: (log√x)/(log x) =(log(x^(1/2)))/(log x) =((1/2)log x)/(log x) =1/2 25. 答:0 解: log(x^2)-2log x =2log x-2log x =0 26. 答:0 解: 3log x-log(x^3) =3log x-3log x =0 27. 答:-2/3 解: (log3√(x^2))/(log (1/x)) =(logx^(2/3))/(log x^(-1)) =((2/3)log x)/((-1)log x) =(2/3)/(-1) =-2/3 28. 答:-7/4 解: (log√x-4log x)/(log(x^2)) =((1/2)log x-4log x)/(2log x) =((-7/2)log x)/(2log x) =(-7/2)/2 =-7/4 9. 答:10 解: log(3)(3^10) =10 10. 答:-6 解: log(2)(4^(-3)) =log(2)((2^2)^(-3)) =log(2)(2^(-6)) =-6 11. 答:16 解: log(4^8*25^8) =log((4*25)^8) =log(100^8) =log((10^2)^8) =log(10^16) =16 12. 答:4 解: (log64)/(log16) =(log(16^4))/(log16) =(4log16)/(log16) =4 13. 答:2/9 解: (log(3√9))/(log27) =(log((3^2)^(1/3)))/(log(3^3)) =(log(3^(2/3)))/(log(3^3)) =((2/3)log3)/(3log3) =(2/3)/3 =2/9 14. 答:6 解: (3log25)/(1-log2) =(3log(5^2))/(log10-log2) =(6log5)/(log(10/2)) =(6log5)/(log5) =6