-6x+9x^2=-1,求x
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-6x+9x^2=-1,求x-6x+9x^2=-1,求x-6x+9x^2=-1,求x-6x+9x^2=-1得9x^2-6x+1=0得(3x-1)^2=0得3x-1=0得x=1/3
-6x+9x^2=-1,求x
-6x+9x^2=-1,求x
-6x+9x^2=-1,求x
-6x+9x^2=-1
得 9x^2-6x + 1 = 0
得 (3x-1)^2 = 0
得 3x-1=0
得 x= 1/3
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