x^2-3x(x-3)-9
=x²-3x-9-9
=x²-3x-18
=(x-6)(x+3)x^2-3x(x-3)-9
=x²-3x-9-9
你这怎么算的嘞?3乘以(x-3)=3x-9额,题目是3x乘以(x-3)x²-3x(x-3)-9
=x²-3x²+9x-9
=-2x²+9x-9
=(-2x²+6x)+(3x-9)
=-2x(x-3)+3(x-3)
=(x-3)(-2x+3)
=(x-3)(3-2x)
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