81+3x^3 因式分解y^4-8y x^5-(x^2)(y^3) 急好像是按照a^3+b^3=(a+b)(a^2-ab+b^2),算的,

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81+3x^3因式分解y^4-8yx^5-(x^2)(y^3)急好像是按照a^3+b^3=(a+b)(a^2-ab+b^2),算的,81+3x^3因式分解y^4-8yx^5-(x^2)(y^3)急好像

81+3x^3 因式分解y^4-8y x^5-(x^2)(y^3) 急好像是按照a^3+b^3=(a+b)(a^2-ab+b^2),算的,
81+3x^3 因式分解
y^4-8y x^5-(x^2)(y^3) 急
好像是按照a^3+b^3=(a+b)(a^2-ab+b^2),算的,

81+3x^3 因式分解y^4-8y x^5-(x^2)(y^3) 急好像是按照a^3+b^3=(a+b)(a^2-ab+b^2),算的,
81+3x^3
=3(x^3+3^3)
=3(x+3)(x^2-3x+9)
y^4-8y
=y(y^3-2^2)
=y(y-2)(y^2+2y+4)
x^5-(x^2)(y^3)
=x^2(x^3-y^3)
=x^2(x-y)(x^2+xy+y^2)

1. =y(y^3-2^3)=y(y-2)(Y^2+2y+4)
2. =x^2(x^3-y^3)=x^2(x-y)(x^2+xy+y^2)

81+3x^3 =3（27+x^3)=3(x+3)(x^2-3x+9)
y^4-8y =y(y^3-8)=y(y-2)(y^2+2y+4)
x^5-(x^2)(y^3)=x^2(x^3-y^3)=x^2(x-y)(x^2+xy+y^2)

81+3x³
=3(27+x³)
=3(3+x)(9-3x+x²)
y^4-8y
=y(y³-8)
=y(y-2)(y²+2y+4)
x^5-(x^2)(y^3)
=x²(x³-y³)
=x²(x-y)(x²+xy+y²)

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