a2(
| ||||||||||||
a(
|
A.abc | B.a+b+c | C.
| D.-(a+b+c) |
c2-b2 |
a |
a2-c2 |
b |
b2-a2 |
c |
c-b |
a |
a-c |
b |
b-a |
c |
bc3-b3c+a3c-ac3+ab3-a3b |
abc |
bc2-b2c+a2c-ac2+ab2-a2b |
abc |
c(a-b)(a2+ab+b2)-c3(a-b)-ab(a2-b2) |
c(a-b)(a+b)-c2(a-b)-ab(a-b) |
c(a2+ab+b2)-c3-ab(a+b) |
c(a+b)-c2-ab |
(a-c)(c-b)(a+b+c) |
(a-c)(c-b) |
1 |
a2+a |
1 |
a2+2a+1 |
|a-
| ||||
a+1 |
a-b |
a+b |
b |
a |
A.
| B.
| C.
| D.
|
a |
1+a+ab |
b |
1+b+bc |
c |
1+c+ca |
a+b |
c |
b+c |
a |
c+a |
b |
(a+b)(b+c)(c+a) |
abc |
A.8 | B.8或-1 | C.2或-1 | D.8或-1 |
x2-xz+z2 |
x2+yz+y2 |
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