|
A.a≥0 | B.a≥2 |
C.0<a≤2 | D.a为一切实数 |
2-a |
a |
x |
x+1 |
x |
3 |
a |
π |
π |
x |
A.1个 | B.2个 | C.3个 | D.4个 |
1 |
x-3 |
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
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