log9(x-5)+log9(x=+3)=1 9是那个log的底

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log9(x-5)+log9(x=+3)=1 9是那个log的底
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log9(x-5)+log9(x=+3)=1 9是那个log的底
log9(x-5)+log9(x=+3)=1 9是那个log的底

log9(x-5)+log9(x=+3)=1 9是那个log的底
log9(x-5)(x+3)=log9(9)
x²-2x-15=9
x²-2x-24=0
(x-6)(x+4)=0
真数大于0
x-5>0,x+3>0
所以x=6

x=+3没看懂
反正你就是log9【(x-5)(x=+3)】=1
(x-5)(x=+3)=9
然后去括号以后再求解即可
再由x-5＞0筛选

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