Question

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-

Answer 1

(t-2)(t+1)

(x-1)(y-1)

(x+2y)(x+4y)

(1+x-y)(1-x+y)

(a-b-c)(a-b+c)