a |
3 |
b |
4 |
c |
5 |
a |
b |
a+b-c |
a-b+c |
a |
3 |
b |
4 |
c |
5 |
a |
b |
3k |
4k |
3 |
4 |
a+b-c |
a-b+c |
3k+4k-5k |
3k-4k+5k |
1 |
2 |
3 |
4 |
1 |
2 |
2|a|-1 |
2a+1 |
x |
x-3 |
A.x=0 | B.x≠0 | C.x=3 | D.x≠3 |
2a2-8 |
a2-4a+4 |
ab-3a2 |
-b2+6ab-9a2 |
A.当x=±3时,分式
| ||
B.当x=±2时,
| ||
C.当x≠2时,
| ||
D.x、y为任何有理数时,
|
© 2017-2019 超级试练试题库,All Rights Reserved.