(-3x²)(-x²+2x-1) 等于?

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(-3x²)(-x²+2x-1) 等于?

(-3x²)(-x²+2x-1) 等于?
(-3x²)(-x²+2x-1) 等于?

(-3x²)(-x²+2x-1) 等于?
(-3x²)(-x²+2x-1)
=3x^4-6x³+3x²