log(ab)=log(a)+ log(b)吗我知道log(a)+ log(b)=log(ab),那反过来呢?那 log(a)(X)=c log(b)(X)=d 用c、d表示log(ab)(X)怎么做呢。

log log log log(2)5=a,log(2)7=b用ab表示log(35)28 可以说log a x +log a y=log a log(a)M+log(a)N=? log(8)a+log(4)b^2=5,log(8)b+log(4)a^2=7,求log(2)ab的值 已知log（14）7=a log(14)5=b 用ab表示log(35)70=log(3)4*log(4)8*log(8)m=log(4)2 求m 关于数学对数的换底公式推论的问题已知 log(2)(3) = a,log(3(7)=b,用a,b表示log(42)(56)因为log(2)(3)=a,则1/a=log(3)(2),又∵log(3)(7)=b,∴log(42)(56)=log(3)(56)/log(3)(42)=log(3)(7)+3·log(3)(2)/log(3)(7)+log(3)(2)+1=ab+3/ab+b+1 关于数学对数的换底公式推论的问题已知 log(2)(3) = a,log(3(7)=b,用a,b表示log(42)(56)因为log(2)(3)=a,则1/a=log(3)(2),又∵log(3)(7)=b,∴log(42)(56)=log(3)(56)/log(3)(42)=log(3)(7)+3·log(3)(2)/log(3)(7)+log(3)(2)+1=ab+3/ab+b+1 设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45)设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45) 已知log（3）2=a log（5）2=b用ab表示log（30)90 已知 log (a) ab=1/p ,则 log (ab) a/b=__ __. log(ab)=log(a)+ log(b)吗我知道log(a)+ log(b)=log(ab),那反过来呢?那 log(a)(X)=c log(b)(X)=d 用c、d表示log(ab)(X)怎么做呢。 log a b=log b a,则：ab=?a不等于b log(a)(b)=log(c)(b) /log(c)(a) 怎么证log(a)(b)=log(c)(b) /log(c)(a)怎么证 log a c+log b c=0(c≠1),则ab+c-abc=? log a c+log b c=0(c≠1),则ab+c-abc=?