15.若(x+p)(x+2)=x2+2p,则p的值是( )
| A. | -2 | B. | -1 | C. | 1 | D. | 2 |
14.若am=8,an=2,则am-n等于( )
| A. | 2 | B. | 4 | C. | 6 | D. | 16 |
12.
如图,将四边形ABCD先向左平移2个单位长度,再向上平移1个单位长度,那么点B的对应点B′的坐标是( )
| A. | (4,-1) | B. | (-4,-1) | C. | (4,1) | D. | (5,1) |
8.
如图,已知O是平行四边形ABCD的对角线交点,AC=10,BD=16,AD=11,那么△OBC的周长等于( )
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| A. | 13 | B. | 24 | C. | 37 | D. | 38 |