2.
如图,抛物线y=2x2+bx+c的顶点在△OAB的边OB、AB上运动(不经过点O,点A),已知A(0,2),B(-2,1),则下列说法错误的是( )
| A. | 0<b≤8 | B. | 0<c≤9 | C. | 1+2c>b | D. | b2<8c-16 |
16.下列各组运算中结果相等的是( )
| A. | -24与(-2)4 | B. | (-1)4与(-1)2016 | C. | -(-8)与-|-8| | D. | 52与25 |
14.下列各式计算中,能用平方差公式计算的是( )
0 287820 287828 287834 287838 287844 287846 287850 287856 287858 287864 287870 287874 287876 287880 287886 287888 287894 287898 287900 287904 287906 287910 287912 287914 287915 287916 287918 287919 287920 287922 287924 287928 287930 287934 287936 287940 287946 287948 287954 287958 287960 287964 287970 287976 287978 287984 287988 287990 287996 288000 288006 288014 366461
| A. | (4x-5y)(-5y-4x) | B. | (-4x+5y)(-5y+4x) | C. | (-4x-5y)(5y+4x) | D. | (4x-5y)(5y-4x) |