y=3x^2-2x+1配方
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y=3x^2-2x+1配方
y=3x^2-2x+1配方
y=3x^2-2x+1配方
y=3(x²-2x/3)+1
=3(x²-2x/3+1/9-1/9)+1
=3(x²-2x/3+1/9)-1/3+1
=3(x-1/3)²+2/3
y=3x^2-2x+1配方
y=3x^2-2x+1配方
y=3x^2-2x+1配方
y=3(x²-2x/3)+1
=3(x²-2x/3+1/9-1/9)+1
=3(x²-2x/3+1/9)-1/3+1
=3(x-1/3)²+2/3