问题
解答题
(1)因式分3x2-6xy+3y2;
(2)化简:(x+2)2-(x+1)(x-1).
答案
(1)3x2-6xy+3y2,
=3(x2-2xy+y2),
=3(x-y)2;
(2)(x+2)2-(x+1)(x-1),
=x2+4x+4-x2+1,
=4x+5.
(1)因式分3x2-6xy+3y2;
(2)化简:(x+2)2-(x+1)(x-1).
(1)3x2-6xy+3y2,
=3(x2-2xy+y2),
=3(x-y)2;
(2)(x+2)2-(x+1)(x-1),
=x2+4x+4-x2+1,
=4x+5.