1.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4._数学解答

1.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4.10(y+2)^2-29(y+2)+10
1.24xy^4+2x^3y^2-2x^5
2.4x^4y^2-5x^2y^2-9y^2
3.24x^2y-30xy-75y
4.10(y+2)^2-29(y+2)+10

人气：301 ℃　时间：2020-03-27 23:08:27

解答

(1).24xy^4+2x^3y^2-2x^5=2x(12y^4+x^2y^2-x^4)=-2x(x^4-x^2y^2-12y^4)=-2x(x^2+3y^2)(x^2-4y^2)=-2x(x^2+3y^2)(x+2y)(x-2y)(2).4x^4y^2-5x^2y^2-9y^2 =y^2(4x^4-5x^2-9)=y^2(4x^2-9)(x^2+1)=y^2(2x-3)(2x+3)(x^2+1)...