x |
3 |
y |
4 |
z |
5 |
x+y+z |
z |
x |
3 |
y |
4 |
z |
5 |
x+y+z |
z |
3k+4k+5k |
5k |
12 |
5 |
12 |
5 |
a+b |
c |
b+c |
a |
c+a |
b |
A.2 | B.-1 | C.2或-1 | D.不存在 |
a+b-c |
c |
a-b+c |
b |
-a+b+c |
a |
A.1 | B.-2 | C.-2或1 | D.以上都不对 |
a |
b |
2 |
3 |
A.a=2cm,b=3cm | B.a=2k,b=3k(k≠0) | ||
C.3a=2b | D.a=
|
a |
b |
3 |
5 |
a+b |
b |
A.
| B.
| C.
| D.
|
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