A.当x=±3时,分式
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B.当x=±2时,
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C.当x≠2时,
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D.x、y为任何有理数时,
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(x-3)2 |
x2+9 |
x2-4 |
x2-2x |
1 |
1-|x-1| |
x2+1 |
x2+y2+2 |
4 |
a |
1 |
2 |
x |
3 |
x2-y2 |
x+y |
3x |
2π |
2 |
x |
x |
2x-3 |
x-1 |
x+2 |
5x |
x2+1 |
4x |
3 |
4 |
x+y |
x2+2 |
π+1 |
5 |
8 |
1 |
m |
1 |
x |
A.2个 | B.3个 | C.4个 | D.5个 |
x2 |
3 |
1 |
y+2 |
a2-1 |
a-1 |
3 |
m |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
x-1 |
x2-1 |
x-1 |
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