多项式x^5-(-4x^4y+5xy^4)-6(-x^3y^2+x^2y^3)+(-3y^5)去括号后按字幕x的降幂排列为什麼

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多项式x^5-(-4x^4y+5xy^4)-6(-x^3y^2+x^2y^3)+(-3y^5)去括号后按字幕x的降幂排列为什麼

x^5+4x^4y+6x^3y^2-6x^2y^3-5xy^4-3y^5

x^5-(-4x^4y+5xy^4)-6(-x^3y^2+x^2y^3)+(-3y^5)
=x^5+4x^4y-5xy^4+6x^3y^2-6x^2y^3-3y^5
=x^5+4x^4y+6x^3y^2-6x^2y^3-5xy^4-3y^5

x^5-(-4x^4y+5xy^4)-6(-x^3y^2+x^2y^3)+(-3y^5)
=x^5+4x^4y-5xy^4+6x^3y^2-6x^2y^3-3y^5

多项式x^5-(-4x^4y+5xy^4)-6(-x^3y^2+x^2y^3)+(-3y^5)去括号后按字幕x的降幂排列为:
x^5+4x^4y+6x^3y^2-6x^2y^3-5xy^4-3y^5

原式=x^5+4x^4y-5xy^4+6x^3y^2-6x^2y^3-3y^5
=x^5+4x^4y+6x^3y^2-6x^2y^3-5xy^4-3y^5

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