x |
x+1 |
xy |
() |
3xy |
x2-2x |
() |
x-2 |
x |
x+1 |
xy |
(x+1)•y |
xy |
xy+y |
3xy |
x(x-2) |
x•3y |
x(x-2) |
3y |
x-2 |
A.代数式
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B.当x=-3时,分式
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C.
| ||||
D.当a=-
|
A.
| B.
| ||||||||
C.
| D.
|
a2-4b2 |
a2+2ab |
A.-
| B.
| C.
| D.-2b |
3 |
x-2 |
3x |
x2-2x |
A.x>0 | B.x<0 | C.x≠2 | D.x≠0且x≠2 |
a |
a+b |
A.是原来的2倍 | B.是原来的
| ||
C.不变 | D.是原来的
|
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