1 |
ab+c-1 |
1 |
bc+a-1 |
1 |
ca+b-1 |
A.-1 | B.-
| C.2 | D.-
|
1 |
2 |
1 |
(a-1)(b-1) |
1 |
(b-1)(c-1) |
1 |
(c-1)(a-1) |
c-1+a-1+b-1 |
(a-1)(b-1)(c-1) |
-1 |
(ab-a-b+1)(c-1) |
-1 |
abc-ac-bc+c-ab+a+b-1 |
-1 | ||
1-
|
2 |
3 |
2 |
1 |
a |
1 |
b |
3 |
a-b |
2 |
x2-1 |
1 |
x-1 |
2x |
x2-1 |
2 |
1 |
a-1 |
x2-2x+1 |
x2-x |
x2-1 |
2x |
3 |
2 |
x2+2x+1 |
x2-1 |
x2+x |
x-1 |
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