Question

-5x*(x^2y-xy^2)-2x^2(1/2xy+y^2)

Answer 1

-5x*(x^2y-xy^2)-2x^2(1/2xy+y^2)
=-5x^3y+5x^2y^2-x^3y-2x^2y^2
=3x^2y^2-6x^3y
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追问

（-1/3a^2b)^3*(-2ab^2)^4÷(-4a^2b)^2

追答

（-1/3a^2b)^3*(-2ab^2)^4÷(-4a^2b)^2
=-1/27a^6b^3*(16a^4b^8)÷（16a^4b^2)
=-1/27a^6b^3*b^6
=-1/27a^6b^9

Answer 2

-5x*(x^2y-xy^2)-2x^2(1/2xy+y^2)
=-5x^3y+x^2y^2-x^3y-2x^2y^2
=-4x^3y-x^2y^2

追问

（-1/3a^2b)^3*(-2ab^2)^4÷(-4a^2b)^2