分解成因式:1.x^3-5x^2y-24xy^2 2.-2m^2+7m-3
2个回答

1.x^3-5x^2y-24xy^2

=x*(x²-5xy-24y²)

=x(x-8)(x+3)

2.-2m^2+7m-3

= -(2m²-7m+3)

= -(2m-1)(m-3)

3 9x^4-82x+9

=(9x^2-1)(x^-9)

=(3x+1)(3x-1)(x+3)(x-3)

4 1/5x^2-3x+10

=1/5x^2-3x+10

=(1/5)*(x^2-15x+50)

=(1/5)(x-5)(x-10)

5 x^3-x^2-y^3+y^2

=x^3-y^3-(x²-y²)=(x-y)(x²+xy+y²)-(x-y)(x+y)

=(x-y)(x²+xy+y²-x-y)

6 x^2-6xy+9y^2-3x+9y

=(x-3y)² -3(x-3y)

=(x-3y)(x-3y-3)