x2-2x-3 |
x2-9 |
A.-1 | B.3 | C.3或-1 | D.±3 |
m+3 |
m+1 |
A.2个 | B.3个 | C.4个 | D.5个 |
A.若x2=4,则x=2 | ||
B.方程x(2x-1)=2x-1的解为x=1 | ||
C.若x2+2x+k=0两根的倒数和等于4,则k=-
| ||
D.若分式
|
2x+2 |
x2-1 |
| ||
x-2 |
A.x<-3 | B.x≥-3 | C.x>2 | D.x≥-3且x≠2 |
| ||
x-2 |
A.x≥1 | B.x≤1 | C.x≥1且x≠2 | D.x>2 |
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