问题标题：
因式分解练习题6x^2-7xy-3y^2-xz+7yz-2z^22x^4-x^3-6x^2-x+2(x+1)^4+(x+3)^4-272xy(xy+1)+(xy+3)-2(x+y+0.85)-(x+y-1)^2x^3+8y^3-z^3+6xyzx^2+5xy+6y^2+8x+18y+12x^2+2xy-8y^2+2x+14y-3
问题描述：
因式分解练习题
6x^2-7xy-3y^2-xz+7yz-2z^2
2x^4-x^3-6x^2-x+2
(x+1)^4+(x+3)^4-272
xy(xy+1)+(xy+3)-2(x+y+0.85)-(x+y-1)^2
x^3+8y^3-z^3+6xyz
x^2+5xy+6y^2+8x+18y+12
x^2+2xy-8y^2+2x+14y-3
陈会勇回答：
1.6X^2-7xy-3y^2-xz+7yz-2z^2=(3x+y-2z)(2x-3y+z)2.（2x-1）(x^3-3x-2)=(2x-1)[x(x-2)(x+2)+(x-2)]=（2x-1）(x-2)(x^2+2x+1)=（2x-1）(x-2)(x+1)^23.（x+1）^4+(x+3)^4-272=(x+3)^4-4^4+(x+1)^4-2^4（平方差）=[(...
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