(1)a的平方+3a+2 =(a+1)(a+2)
(2)a的平方-3a+2 =(a-1)(a-2)
(3)a的平方+9a+8 =(a+1)(a+8)
(4)a的平方-6a+8=(a-2)(a-4)
(5)a的平方-a-2 =(a-2)(a+1)
(6)a的平方+a-2=(a+2)(a-1)
(7)a的平方-2a-8 =(a-4)(a+2)
(8)a的平方+7a-8=(a+8)(a-1)
(1)a的平方+3a+2 =(a+1)(a+2)
(2)a的平方-3a+2 =(a-1)(a-2)
(3)a的平方+9a+8 =(a+1)(a+8)
(4)a的平方-6a+8=(a-2)(a-4)
(5)a的平方-a-2 =(a-2)(a+1)
(6)a的平方+a-2=(a+2)(a-1)
(7)a的平方-2a-8 =(a-4)(a+2)
(8)a的平方+7a-8=(a+8)(a-1)