17.已知点$({-1,{y_1}}),({-3\frac{1}{2},{y_2}}),({\frac{1}{2},{y_3}})$都在抛物线y=3(x+1)2-2上,则y1,y2,y3的大小关系为( )
| A. | y1>y2>y3 | B. | y2>y1>y3 | C. | y2>y3>y1 | D. | y3>y1>y2 |
10.
已知y=ax2+bx+c(a≠0)在平面直角坐标系中的图象如图所示,则下列结论正确的是( )
0 307894 307902 307908 307912 307918 307920 307924 307930 307932 307938 307944 307948 307950 307954 307960 307962 307968 307972 307974 307978 307980 307984 307986 307988 307989 307990 307992 307993 307994 307996 307998 308002 308004 308008 308010 308014 308020 308022 308028 308032 308034 308038 308044 308050 308052 308058 308062 308064 308070 308074 308080 308088 366461
| A. | a<0 | B. | c>0 | C. | 2a+b=0 | D. | 4a+2b+c>0 |