题目
因式分解:3x2+4xy-y2.
提问时间:2021-02-24
答案
3x2+4xy-y2
=3(x2+
xy-
y2)
=3[(x2+2×
xy+
y2)-
y2-
y2]
=3[(x+
y)2-
y2]
=3(x+
y+
=3(x2+
4 |
3 |
1 |
3 |
=3[(x2+2×
2 |
3 |
4 |
9 |
1 |
3 |
4 |
9 |
=3[(x+
2 |
3 |
7 |
9 |
=3(x+
2 |
3 |
|