A、△=b 2-4ac=(-5) 2-4×2×(-99)=817>0,故有实根.
B、△=b 2-4ac=3 2-4×1×3=-3<0,故无实根.
C、△=b 2-4ac=(-3) 2-4×1×1=5>0,故有实根.
D、△=b 2-4ac=(-2) 2-4×3×0=4>0,故有实根.
故选B.
A、△=b 2-4ac=(-5) 2-4×2×(-99)=817>0,故有实根.
B、△=b 2-4ac=3 2-4×1×3=-3<0,故无实根.
C、△=b 2-4ac=(-3) 2-4×1×1=5>0,故有实根.
D、△=b 2-4ac=(-2) 2-4×3×0=4>0,故有实根.
故选B.