y=log(4)(1-2x+x^2) =log(2)[(1-x)^2] /log(2)(4) =2[log(2)|1-x|] /2 这几步不太理解,注:题中是以4为底和以2为底
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y=log(4)(1-2x+x^2) =log(2)[(1-x)^2] /log(2)(4) =2[log(2)|1-x|] /2 这几步不太理解,注:题中是以4为底和以2为底