A.8 | B.-8 | C.64 | D.8或-8 |
|
A.b>0,d<0,a<c | B.b>0,d>0,a>c | C.b<0,d>0,a>c | D.b<0,d>0,a<c |
A.3x+4y+4="0" | B.3x+4y-4="0" | C.6x+8y+4="0" | D.6x+8y-4=0 |
A.x-2y+7="0" | B.2x+y-1="0" | C.x-2y-5="0" | D.2x+y-5=0 |
A.2x-y-1="0" | B.x+2y-1="0" | C.2x-y+1="0" | D.x+2y+1=0 |
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