Question

-15x的4次方y-20x的3次方y的3次方+5x的2次方y的3次方

Answer 1

x的五次方+3x的四次方y-5x的三次方y的二次方-15x的平方y的三次方+4xy的四次方+12y的五次方
=x^5+3x^4y-5x^3y^2-15x^2y^3+4xy^4+12y^5
=x^4(x+3y)-5x^2y^2(x+3y)+4y^4(x+3y)
=(x+3y)(x^4-5x^2y^2+4y^4)
=(x+3y)(x²-y²)(x²-4y²)
=(x+3y)(x-y)(x+y)(x-2y)(x+2y)
=(x+y)(x+2y)(x+3y)(x-y)(x-2y)
∴值不可为33
∵x=y时
原式的值等于0
求采纳为满意回答。

Answer 2

= (-5x²y)×3x²+(-5x²y)×4xy²-(-5x²y)×y²
=(-5x²y)×(3x²+4xy²-y²)