已知x,y,z均为正实数,且3的x次方=4的y次方=6的z次方 求证:z分之1减x分之1=2y分之1
人气:109 ℃ 时间:2019-08-19 07:03:16
解答
同时取对数令:xlg3=ylg4=zlg6=m
则 1/x =lg3 /m
1/y =lg4 /m
1/z=lg6 /m
1/z - 1/x = (lg6 - lg3)/m = lg2 /m
1/(2y) = (1/2)lg4 /m = lg2 /m
得证.
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