log4 (x+2) = log2 (2x-1)
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log4 (x+2) = log2 (2x-1)
log4 (x+2) = log2 (2x-1)
log4 (x+2) = log2 (2x-1)
log4 (x+2) =(1/2)log2 (x+2)=log2 [(x+2)]^0.5
所以
[(x+2)]^0.5= (2x-1)
x+2=(2x-1)^2
4x^2-5x-1=0
log2(x-2)=log4(5-x)
log4 (x+2) - log2 (x-1) = 是不是要把log4 转换成log2
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