a |
b+c |
b |
c+a |
c |
a+b |
A.
| B.
| C.-1 | D.
|
a |
b+c |
-(b+c) |
b+c |
a+b+c |
(b+c)+(c+a)+(a+b) |
1 |
2 |
1 |
2 |
x |
3 |
y |
4 |
z |
5 |
x+y+z |
x |
c |
a+b |
a |
b+c |
b |
c+a |
A.-1 | B.
| C.2或-1 | D.
|
A.10 | B.8 | C.-8 | D.±8 |
A.1:20 | B.1:20000 | C.1:200000 | D.1:2000000 |
a+2b |
2a-b |
9 |
5 |
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