(3x²y-2x+1)(-2xy)等于多少?

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(3x²y-2x+1)(-2xy)等于多少?
(3x²y-2x+1)(-2xy)等于多少?

(3x²y-2x+1)(-2xy)等于多少?
(3x²y-2x+1)(-2xy)
=-6x^3y^2+4x^2y-2xy