5x(2x^2-3x+4)
-6x(x-3y),,,-2a^2(1/2ab+b^2),,,(2/3x^2y-6xy)*1/2xy^2(2/3x^2y-6xy)*1/2xy^2...
-6x(x-3y),,,-2a^2(1/2ab+b^2),,,(2/3x^2y-6xy)*1/2xy^2
(2/3x^2 y-6xy)*1/2xy^2 展开
(2/3x^2 y-6xy)*1/2xy^2 展开
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