2.()+()& gt； () × () [The same integer must be added in brackets]

3.()+( )= ()×( )[ The same integer must be added in brackets]

4.( )×( )×( )=( )+( )+( )

5. There are 10 candles in a house. A gust of wind blew out six candles. Mother closed the doors and windows. There are () candles in the room in the morning.

6. Mom gave Xiaoming a big box with six paper boxes, and each paper box has four small boxes. Xiaoming has () boxes.

7. There is a long-distance race on the sports field. There are seven people running in front of each runner and seven people running behind each runner. There are () athletes on the playground now.

8. A snail wants to climb out of the dry well to see how big the sky is. It climbs 3 meters every day and goes down 2 meters at night. I didn't get up until the eighth day.

. This dry well is 10 meter deep.

9.

Language. (1) The head and tail are integrated, and the waist is also integrated. It looks like one, but it's not one. ( )