问题
填空题
分解因式:3a2-27=______;a3-4a2+4a=______;y2-2y-8=______.
答案
3a2-27=3(a2-9)=3(a+3)(a-3);
a3-4a2+4a=a(a2-4a+4)=a(a-2)2;
y2-2y-8=(y-4)(y+2).
分解因式:3a2-27=______;a3-4a2+4a=______;y2-2y-8=______.
3a2-27=3(a2-9)=3(a+3)(a-3);
a3-4a2+4a=a(a2-4a+4)=a(a-2)2;
y2-2y-8=(y-4)(y+2).