C candynl New member Xu 0 29/10/13 #1 gpt 1) log(2)(x^2 +x+1) +log(2)(x^2-x+1) = log(2)(x^4 +x^2 +1) +log(2)(x^4 -x^2 +1) 2) log(27)(x^2 -5x +6)^3 =1/2.log(căn 3)[(x-3)/2] +log(9)(x-3)^2 3) 2^log(5)(x+3) =x 4) log(2)( 1+ căn x) =log(3)x
gpt 1) log(2)(x^2 +x+1) +log(2)(x^2-x+1) = log(2)(x^4 +x^2 +1) +log(2)(x^4 -x^2 +1) 2) log(27)(x^2 -5x +6)^3 =1/2.log(căn 3)[(x-3)/2] +log(9)(x-3)^2 3) 2^log(5)(x+3) =x 4) log(2)( 1+ căn x) =log(3)x