(1)n(m-2)(n+1) (2)(x+y)(x+3y) (3)(a+b-2)(a-b-2) (4)(p-q)(m+1)(m-1) (5)a²(b+c) (6)4(2x-1)(2-x) (7)(a+b+c)(a+b-c)(c+a-b)(c-a+b) (8)(m+a-2b)(m-a+2b)
(1)n(m-2)(n+1) (2)(x+y)(x+3y) (3)(a+b-2)(a-b-2) (4)(p-q)(m+1)(m-1) (5)a²(b+c) (6)4(2x-1)(2-x) (7)(a+b+c)(a+b-c)(c+a-b)(c-a+b) (8)(m+a-2b)(m-a+2b)