a |
b |
b |
c |
c |
a |
3a+2b+c |
a-2c-3c |
a |
b |
b |
c |
c |
a |
3a+2b+c |
a-2c-3c |
6a |
-4a |
3 |
2 |
3 |
2 |
1 |
a+b |
1 |
b+c |
1 |
c+a |
14 |
17 |
a |
b+c |
b |
c+a |
c |
a+b |
x-y |
a |
y-z |
b |
z-x |
c |
A.1个 | B.2个 | C.3个 | D.4个 |
x+y |
z |
y+z |
x |
z+x |
y |
a |
b |
2 |
3 |
a |
a-b |
a |
b |
c |
d |
e |
f |
5 |
7 |
2a-c+7e |
2b-d+7f |
2a-c |
2b-d |
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