1个回答
展开全部
3x2-xy-y2=3x2-(
x2+xy+y2)+
x2
=
x2-(
x+y)2
=(
x+
x+y)(
x-
x-y)
=(
x+y)(
x-y).
故答案为:(
x+y)(
1 |
4 |
1 |
4 |
=
13 |
4 |
1 |
2 |
=(
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
=(
| ||
2 |
| ||
2 |
故答案为:(
| ||
2 |
|