-3x(x^2-2xy)-(9x^3y^3+12x^2y^4)÷(-3y^3),其中x=-1,y=-2

youxi822022-10-04 11:39:541条回答

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ljq_008 共回答了19个问题 | 采纳率84.2%
-3x(x^2-2xy)-(9x^3y^3+12x^2y^4)÷(-3y^3)
=-3x^3+6x^2y+3x^3+4x^2y
=10x^2y
=10×1×(-2)
=-20
1年前

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=x(x-y+1)
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(3).9x^3y^3-21x^3y^2+12x^2y^2
=3x²y²(3xy-7x+4y)
(4).x^2(x-y)+y^2(x-y)
=(x-y)(x²+y²)
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