已知p：“面积相等的三角形全等”，q：“若m≤1，则方程x2-2x+m=0有实根”．试判断下列命题的真假：
（1）p∨q；（2）p∧q；（3）p∨（¬q）．
∵面积相等的三角形不一定全等，∴命题p为假命题．命题￢p为真命题．
∵若m≤1，则方程x2-2x+m=0的△≥0，方程有实根，∴命题q为真命题．命题￢q为假命题．
∴命题“p∨q”是真命题，命题“p∧q”是假命题，命题“p∨¬q”是假命题．
| 选词填空。 从方框里选择正确的单词，并用其正确的形式填空。 | |
2. The cool water_____ him after his long sleep. 3. I got an _____shock from the wire. 4. We have to find ways of making the ____system work better. 5. This kind of dress is only appropriate for____ affairs. 6. I missed the train and_____ was late for work. 7. I made a _____of $100 to the Famine Relief Fund. 8. I was asked to give a short _____on the aims of the plan. 9. Exercise and good food are important to the proper ____of a child. 10. She was _____in England in the 1930s. |