问题
计算题
(1)因式分解:3x2﹣6xy+3y2;
(2)化简:(x+2)2﹣(x+1)(x﹣1)。
答案
解:(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)因式分解:3x2﹣6xy+3y2;
(2)化简:(x+2)2﹣(x+1)(x﹣1)。
解:(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.