题目内容
下面各分式:
,
,
,
,其中最简分式有( )个.
| x2-1 |
| x2+x |
| x+y |
| x2-y2 |
| x2-x-2 |
| x+1 |
| 16x2-4 |
| x+4 |
| A.4 | B.3 | C.2 | D.1 |
| x2-1 |
| x2+x |
| (x+1)(x-1) |
| x(x+1) |
| x-1 |
| x |
| x+y |
| x2-y2 |
| x+y |
| (x+y)(x-y) |
| 1 |
| x-y |
| x2-x-2 |
| x+1 |
| (x+1)(x-2) |
| x+1 |
| 16x2-4 |
| x+4 |
故选D.
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