5.
如图,△ABC中,BC=4,DE是中位线,则DE的长为( )
| A. | 4 | B. | 3 | C. | 2$\sqrt{3}$ | D. | 2 |
17.已知y是x的二次函数,y与x的部分对应值如下表:
该二次函数图象向左平移3个单位,图象经过原点.
0 295732 295740 295746 295750 295756 295758 295762 295768 295770 295776 295782 295786 295788 295792 295798 295800 295806 295810 295812 295816 295818 295822 295824 295826 295827 295828 295830 295831 295832 295834 295836 295840 295842 295846 295848 295852 295858 295860 295866 295870 295872 295876 295882 295888 295890 295896 295900 295902 295908 295912 295918 295926 366461
| x | … | -1 | 0 | 1 | 2 | … |
| y | … | 0 | 3 | 4 | 3 | … |