A.(-∞,0) B.(0,+∞) C.(2,+∞) D.(3,+∞)
A.3 B.-5 C.-40 D.-37
A.a=1,b=-3,c=2 B.Ba≠0的實(shí)數(shù),b為任意實(shí)數(shù),c=1 C.a=1,b=0,c=2 D.a=0,b為任意實(shí)數(shù),c=1