A.若x2=4,则x=2 | ||
B.若3x2=6x,则x=2 | ||
C.x2+x+k=0的一个根是1,则k=2 | ||
D.若分式
|
x(x-2) |
x |
| ||
x-4 |
A.x>3 | B.x≥3 | C.x>4 | D.x≥3且x≠4 |
x |
x+2 |
A.x≠2 | B.x≠-2 | C.x>-2 | D.x<2 |
x2-1 |
x+1 |
b2-1 |
b2-2b-3 |
A.1 | B.-1 | C.±1 | D.2 |
ab |
5 |
2x2 |
x |
x2-1 |
x+1 |
3x |
2x+y |
1 |
y |
A.5个 | B.4个 | C.3个 | D.2个 |
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