⊙O的直径为10，弦AB=8，点P为AB上一动点，若OP的值为整数，则满足条件的P点有______个．
过O作OC⊥AB于C，连接OA；
Rt△OAC中，OA=5cm，AC=4cm；
∴OC=
=3cm；OA2-AC2
∴3≤OP≤5；
故OP=3cm，或4cm，或5cm；
当OP=3cm时，P与C点重合，有一个符合条件的P点；
当OP=4cm时，P位于AC或BC之间，有两个符合条件的P点；
当OP=5cm时，P与A或B重合，有两个符合条件的P点；
故满足条件的P点有5个．
| 句式转换。 1. That's my sister. (改为复数形式) _____ are my _____. 2. This is an egg. (改为复数形式) _____ _____ eggs. 3. Those are her cousins. (改为单数形式) _____ _____ her _____. 4. These are his brothers. (改为单数形式) _____ _____ his _____. 5. His brother is a worker. (改为一般疑问句) _____ _____ brother a worker ? 6. These are your brothers. (改为否定句) _____ _____ your brothers. 7. She is my aunt. (改为一般疑问句) _____ she _____ aunt? 8. His keys are on the sofa. (改为一般疑问句并作简短肯定、否定回答) _____ _____ keys on the sofa? Yes, _____ _____ . _____ they _____. 9. Her backpack is on the bed. (画线提问) _____ _____ her backpack? 10. The baseballs are under the sofa. (画线提问) _____ _____ _____ _____. |