(log5根号2*log49^81)/(log25^(1/3)*log7^立方根4)

(log5根号2*log49^81)/(log25^(1/3)*log7^立方根4) (log5根号2*log49 81)/(log25 1/3*log7 4开3次方）=? （log5根号2底乘以log根号7底3 ）/log根号5底3分之1乘以log7底4的立方根 数学(log5 √2*log7 9)/(log5 1/3 *log7 3√4)+log2( √(3+√5)- log√( (log4 3+log8 3)(log3 5+log9 5)(log5 2+log25 2)= 求值(log2 5+log4 1/5)(log5 2+log25 1/2) [log2 (125) +log4(25)+log8(5)][log125(8)+log25(4)+log5(2)] [log2 (125) +log4(25)+log8(5)][log125(8)+log25(4)+log5(2) (Log2 125+log4 25+log8 5)(log5 2+log25 4+log125 求下列函数的定义域 y=log5(1-x) y=1/log2x y=log7乘以1/1-3x y=根号下log3x log10是什么?log 75 - log 3 + log 4＝log25＋log3－log3＋2log2＝2log5＋ (log2^5+log4^0.2)(log5^2+log25^0.25)化简