∴
2 |
2-x |
4 |
4-y |
16-2x-4y |
(2-x)(4-y) |
16-2x-4y |
9-2x-4y |
7 |
9-(2x+4y) |
7 | ||
9-2
|
7 | ||
9-4
|
7(9+4
| ||
49 |
16+4
| ||
7 |
即
2 |
2-x |
4 |
4-y |
16+4
| ||
7 |
故答案为
16+4
| ||
7 |
2 |
2-x |
4 |
4-y |
2 |
2-x |
4 |
4-y |
16-2x-4y |
(2-x)(4-y) |
16-2x-4y |
9-2x-4y |
7 |
9-(2x+4y) |
7 | ||
9-2
|
7 | ||
9-4
|
7(9+4
| ||
49 |
16+4
| ||
7 |
2 |
2-x |
4 |
4-y |
16+4
| ||
7 |
16+4
| ||
7 |