A.(1,3),(5,7),(10,12) | B.(-1,4),(2,1),(-2,5) |
C.(0,2),(2,5),(3,7) | D.(1,-1),(3,3),(5,7) |
A.2 | B.-3 | C.2或-3 | D.-2或-3 |
A.x+2y-2=0或x+2y+2="0" | B.x+2y-2=0或x+y+2=0 |
C.2x+y-2=0或x+2y+2="0" | D.2x+y+2=0或x+2y-2=0 |
A.若c>0,则a>0,b>0 | B.若c>0,则a<0,b>0 |
C.若c<0,则a>0,b<0 | D.若c<0,则a>0,b>0 |
A.2 003 | B.2 004 | C.2 005 | D.2 006 |
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