因式分解:①x(x^2+1)-y(y^2+1) ②a^2-b^2+4a+2b+3

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因式分解:①x(x^2+1)-y(y^2+1) ②a^2-b^2+4a+2b+3
因式分解:①x(x^2+1)-y(y^2+1) ②a^2-b^2+4a+2b+3

因式分解:①x(x^2+1)-y(y^2+1) ②a^2-b^2+4a+2b+3
①x(x^2+1)-y(y^2+1)
=x³-y³+x-y
=(x-y)(x²+xy+y²)+(x-y)
=(x-y)(x²+xy+y²+1)
②a^2-b^2+4a+2b+3
=(a+2)²-(b-1)²
=(a+2+b-1)(a+2-b+1)
=(a+b+1)(a-b+3)

1, x^3+x-y^3-y
2,(a+2)^2-(b-1)^2

:①x(x^2+1)-y(y^2+1)=x³+x-y³-y=﹙x³-y³﹚+﹙x-y﹚=﹙x-y﹚﹙x²+xy+y²﹚+﹙x-y﹚=﹙x-y﹚﹙x²+xy+y²﹚
②a^2-b^2+4a+2b+3=﹙a+2﹚²-﹙b-1﹚²=﹙a+2-b+1﹚﹙a+2+b-1﹚=﹙a-b+3﹚﹙a+b+1﹚