1.表是二次函数y=ax2+bx+c的部分x,y的对应值:
(1)二次函数图象的开口向上,顶点坐标是(1,-2),m的值为2;
(2)当x>0时,y的取值范围是y≥-2;
(3)当抛物线y=ax2+bx+c的顶点在直线y=x+n的下方时,n的取值范围是n>-3.
0 288653 288661 288667 288671 288677 288679 288683 288689 288691 288697 288703 288707 288709 288713 288719 288721 288727 288731 288733 288737 288739 288743 288745 288747 288748 288749 288751 288752 288753 288755 288757 288761 288763 288767 288769 288773 288779 288781 288787 288791 288793 288797 288803 288809 288811 288817 288821 288823 288829 288833 288839 288847 366461
| x | … | -1 | -$\frac{1}{2}$ | 0 | $\frac{1}{2}$ | 1 | $\frac{3}{2}$ | 2 | $\frac{5}{2}$ | 3 | … |
| y | … | m | $\frac{1}{4}$ | -1 | $-\frac{7}{4}$ | -2 | $-\frac{7}{4}$ | -1 | $\frac{1}{4}$ | 2 | … |
(2)当x>0时,y的取值范围是y≥-2;
(3)当抛物线y=ax2+bx+c的顶点在直线y=x+n的下方时,n的取值范围是n>-3.