分解因式t^2-t-2,xy-x-y+1 x^2+6xy+8y^2 1-x^2+2xy-y^2 a^2-b^2+2ab-c^2

题目

分解因式t^2-t-2,xy-x-y+1 x^2+6xy+8y^2 1-x^2+2xy-y^2 a^2-b^2+2ab-c^2

答案

(t-2)(t+1)
(x-1)(y-1)
(x+2y)(x+4y)
(1+x-y)(1-x+y)
(a-b-c)(a-b+c)