请问这几个题如何因式分解x^2y＋x^2z-xy^2-y^2z3a^2-2b^2+5ab-2a+3b-1x^2-y^2+
2个回答

1.x^2y＋x^2z-xy^2-y^2z=(x^2y-xy^2)+(x^2z-y^2z)=xy(x-y)+z(x-y)(x+y)

=(x-y)(xy+xz+yz)

2.3a^2-2b^2+5ab-2a+3b-1=(a+2b-1)(3a-b+1)

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

4.ab(a+b)+bc(b+c)+ca(c+a)+2abc

=a^2b+ab^2+a^2c+ac^2+b^2c+bc^2+2abc

=(a^2b+bc^2+2abc )+(ab^2+b^2c) +(a^2c+ac^2)

=b(a+c)^2+b^2(a+c)+ac(a+c)=(a+c)(b^2+ab+bc+ac)

=(a+c)(a+b)(b+c)

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