1 |
x |
x2-y2 |
2 |
1 |
π |
x2+1 |
x2+2x+3 |
A.1 | B.2 | C.3 | D.4 |
1 |
x |
x2+1 |
x2+2x+3 |
x |
(x-3)(x-5) |
A.x=3且x=5 | B.x=3或x=5 | C.x=0且x≠3 | D.x≠3或x≠
|
2 |
x-1 |
x+2y |
5 |
7 |
3x-y |
a |
2 |
x-1 |
x+1 |
1 |
x |
y |
3 |
1 |
2 |
1 |
3 |
x+3 |
3|x|-9 |
x+1 |
x-2 |
A.x≠2 | B.x≠-2 | C.x≠-1 | D.x≠0 |
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