若x^2+2x-3=0,则3x^2+6x-1RT

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若x^2+2x-3=0,则3x^2+6x-1RT若x^2+2x-3=0,则3x^2+6x-1RT若x^2+2x-3=0,则3x^2+6x-1RT3x^2+6x-1=3x^2+6x+9-9-1=(3x^

若x^2+2x-3=0,则3x^2+6x-1RT
若x^2+2x-3=0,则3x^2+6x-1
RT

若x^2+2x-3=0,则3x^2+6x-1RT
3x^2+6x-1 =3x^2+6x+9-9-1=(3x^2+6x+9)-9-1 =3(x^2+2x-3)-10=-10

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