两条化简数学题:a^2(y-3)+a(3-y)+7(y-3)3a(2a-5)-(2a-5)

(1)a²(y-3)+a(3-y)+7(y-3)
＝a²(y-3)-a(a-3)+7(y-3)
＝(y-3)(a²-a+7)
(2)3a(2a-5)-(2a-5)
＝(2a-5)(3a-1).