1 |
x-y |
1 |
x+y |
2y |
x2+2xy+y2 |
3 |
2 |
3 |
2 |
1 |
x-y |
1 |
x+y |
2y |
x2+2xy+y2 |
(x+y)-(x-y) |
(x-y)(x+y) |
(x+y)2 |
2y |
2y |
(x-y)(x+y) |
(x+y)2 |
2y |
x+y |
x-y |
3 |
2 |
3 |
2 |
(
| ||||||||
(
|
2
| ||
2
|
| ||
2 |
A.
| ||||||
B.
| ||||||
C.
| ||||||
D.
|
x2-1 |
x2-2x+1 |
x-1 |
x2+x |
2 |
x |
1 |
x-1 |
x |
x2-1 |
1 | ||
1+
|
1 | ||||
|
1 | ||||
|
1 | ||||
|
1 |
a+2 |
4 |
4-a2 |
3 |
x-2 |
x+2 |
4x |
x2-4 |
1 |
x2-4 |
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