1 |
x-y |
1 |
x+y |
xy2 |
x2-y2 |
=(
1 |
x-y |
1 |
x+y |
(x-y)(x+y) |
xy2 |
=
1 |
x-y |
(x-y)(x+y) |
xy2 |
1 |
x+y |
(x-y)(x+y) |
xy2 |
=
x+y |
xy2 |
x-y |
xy2 |
=
2y |
xy2 |
=
2 |
xy |
当x=
2 |
2 |
2 | ||||
(
|
1 |
x−y |
1 |
x+y |
xy2 |
x2−y2 |
2 |
2 |
1 |
x-y |
1 |
x+y |
xy2 |
x2-y2 |
1 |
x-y |
1 |
x+y |
(x-y)(x+y) |
xy2 |
1 |
x-y |
(x-y)(x+y) |
xy2 |
1 |
x+y |
(x-y)(x+y) |
xy2 |
x+y |
xy2 |
x-y |
xy2 |
2y |
xy2 |
2 |
xy |
2 |
2 |
2 | ||||
(
|