4 |
x-3 |
4 |
x-3 |
4 |
x-3 |
A.3 | B.4 | C.7 | D.8 |
A.{x|ax2+bx+c=0,a,b,c∈R} |
B.{x|ax2+bx+c=0,a,b,c∈R,且a≠0} |
C.{ax2+bx+c=0|a,b,c∈R} |
D.{ax2+bx+c=0|a,b,c∈R,且a≠0} |
A.1 | B.-2 | C.6 | D.2 |
A.{x|-3<x<11,x∈Q} | B.{x|-3<x<11} |
C.{x|-3<x<11,x=2k,k∈N} | D.{x|-3<x<11,x=2k,k∈Z} |
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