-2a^3b^2+4b^3a^2
=2a²b²(2b-a)18x^4y+6x^3y-2x^2y4x^2-1a^3b-abx^4-16a^4-81b^4快答答完好给你分18x^4y+6x^3y-2x^2y=2x²y(9x²+3x-1)4x^2-1=(2x-1)(2x+1)a^3b-ab=ab(a²-1)=ab(a-1)(a+1)x^4-16=(x²-4)(x²+4)=(x-2)(x+2)(x²+4)a^4-81b^4=(a²-9b²)(a²+9b²)=(a-3b)(a+3b)(a²+9b²)-8x^4y+6x^3y-2x^2y-8x^4y+6x^3y-2x^2y==2x²y(9x²+3x-1)