12道因式分解题,不用写出过程,只需写出答案,该题为填空题
问题描述：
12道因式分解题,不用写出过程,只需写出答案,该题为填空题
(1) x²-2xy+y² (2)16+8t+t² (3)25x²-30x+9 (4) 9+12t+4t²
(5) x²+4x+4 (6)x²-10x+25 (7)mx²+14mx+49m (8)2x²-16x+32
(9) 5x³-20x²y+20xy² (10) a.a.a.a+18a³+82a² （10）-64+16m-m² （11）-14a²+7.(a.a.a)+7a
答
(1) x²-2xy+y² =(x-y)²
(2)16+8t+t²=(4+t)²
(3)25x²-30x+9 =(5x-3)²
(4) 9+12t+4t²=(3+2t)²
(5) x²+4x+4 =(x+2)²
(6)x²-10x+25 =(x-5)²
(7)mx²+14mx+49m =m(x+7)²
(8)2x²-16x+32=2(x-4)²
(9) 5x³-20x²y+20xy² =5x(x-2y)²
(10) a.a.a.a+18a³+82a² =a²(a²+18a+82)
（10）-64+16m-m² =-(m-8)²
（11）-14a²+7.(a.a.a)+7a=7a(a-1)²