题目

如果，则的值为_______． 答案：【答案】2020【解析】先对进行适当变形，再把代入，即可求解．∵，∴==0+2020=2020．故答案是：2020．从方框中选出合适的词，并用其适当形式完成短文， 方框中有两项多余  good,what,come,dress,important,parent,hold,nothing,how,necessary    Now lots of parents will buy everything that their children want to have. If they go on doing that,their children won’t know the money 1. from hard work.   Some parents like to 2. birthday parties for their children. If they keep on doing this,their children will think that it is 3. for them to enjoy birthday parties every year. Year after year,maybe they will forget their 4. birthdays and only remember their own. It is against traditional habits.   Many parents don’t let the children do housework. They think children have only one thing to do. They should study hard and do 5. in their lessons. If parents go on doing this,the children will only learn to open their mouths to be fed and stretch out (伸出) their arms to be 6. every day.When the children grow up,they will be able to do 7. ，and they won’t even find a job. Parents should teach the children 8. to do housework because it can help them start good habits of working by themselves.