用logx,logy,logz表示下列各式(1)log(xyz)(2)logxy^2/z(3)logxy^3/根号z(4)log根号x/y^2z
问题描述:
用logx,logy,logz表示下列各式
(1)log(xyz)
(2)logxy^2/z
(3)logxy^3/根号z
(4)log根号x/y^2z
答
(1) logx+logy+logz
(2) 2(logx+logy)-logz
(3) 3(logx+logy)-(1/2)logz
(4) (1/2)logx-2logy-logz
答
(1)log(xyz)=logx+logy+logz(2)logxy^2/z=logxy^2-logz=2(logx+logy)-logz(3)logxy^3/根号z=logxy^3-log根号z=3logxy-1/2logz=3logx+3logy-1/2logz(4)log根号x/y^2z=log根号x-logy^2z=1/2logx-2zlogy公式...