ab |
a+b |
1 |
15 |
bc |
b+c |
1 |
17 |
ca |
c+a |
1 |
16 |
abc |
ab+bc+ca |
A.
| B.
| C.
| D.
|
ab |
a+b |
1 |
15 |
1 |
a |
1 |
b |
bc |
b+c |
1 |
17 |
1 |
b |
1 |
c |
ca |
c+a |
1 |
16 |
1 |
a |
1 |
c |
1 |
a |
1 |
b |
1 |
c |
1 |
a |
1 |
b |
1 |
c |
abc |
ab+bc+ca |
1 | ||
|
1 | ||||||
|
1 |
24 |
3 | 1995x2+1996y2+1997z2 |
3 | 1995 |
3 | 1996 |
3 | 1997 |
1 |
x |
1 |
y |
1 |
z |
A.24 | B.36 | C.27 | D.30 |
A.a=b=c | B.a=b≠c | C.b=c≠a | D.c两两不等 |
1 |
b |
1 |
c |
1 |
a |
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