因式分解:(x+y)(x^2+xy+y^2)-xy(y-x) 3(x-1)^2-18(x-1)+27题目是(1)(x+y)(x^2+xy+y^2)-xy(y-x) (2)3(x-1)^2-18(x-1)+27不小心打错了

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因式分解:(x+y)(x^2+xy+y^2)-xy(y-x)3(x-1)^2-18(x-1)+27题目是(1)(x+y)(x^2+xy+y^2)-xy(y-x)(2)3(x-1)^2-18(x-1)+

因式分解:(x+y)(x^2+xy+y^2)-xy(y-x) 3(x-1)^2-18(x-1)+27题目是(1)(x+y)(x^2+xy+y^2)-xy(y-x) (2)3(x-1)^2-18(x-1)+27不小心打错了
因式分解:(x+y)(x^2+xy+y^2)-xy(y-x) 3(x-1)^2-18(x-1)+27
题目是(1)
(x+y)(x^2+xy+y^2)-xy(y-x)
(2)
3(x-1)^2-18(x-1)+27
不小心打错了

因式分解:(x+y)(x^2+xy+y^2)-xy(y-x) 3(x-1)^2-18(x-1)+27题目是(1)(x+y)(x^2+xy+y^2)-xy(y-x) (2)3(x-1)^2-18(x-1)+27不小心打错了
(x+y)(x^2+xy+y^2)-xy(y-x)
=(x+y)(x^2+xy+y^2)+xy(x+y)
=(x+y)(x^2+xy+y^2+xy)
=(x+y)(x+y)^2
=(x+y)^3
3(x-1)^2-18(x-1)+27
=3[(x-1)^2-6(x-1)+9]
=3[(x-1)-3]^2
=3(x-4)^2

1.a2(x-1)+b2(1-x) =a^2(x-1)-b^2(x-1) =(x-1)(a^2-b^2) =(x-1)(a+b)(a-b) 2.4x^3y^3+4x^2y^3+xy^3 =.xy^3