Day 65438 +0 Height 3-2 = 1m
The next day, the height is 1+3-2 = 2m.
Day 3 Height 2+3-2 = 3m
Day 4 Height 3+3-2 = 4m
Day 5 Height 4+3-2 = 5m
Day 6 Height 5+3-2 = 6m
On the 7th day, the height is 6+3-2 = 7m.
On the eighth day, when the height is 7+3 7+3= 10/0m (not minus 2m at night), you can climb out.
Extended data:
Addition is the basic method in the four operations (the other three are subtraction, multiplication and division). It is an operation that combines two or more numbers or quantities and then turns them into one number or quantity. The expression symbol of addition is the plus sign "+". When adding in mathematical operations, connect each item with a plus sign. For example, 1+ 1=2.
Important properties of addition:
1, interchangeable, the operation order is not important, and when more than two numbers are added, the addition order is not important.
2, interrelated, repeatedly adding 1 is the same as counting, adding 0 does not change the result. ?
Source: Baidu Encyclopedia-Supplement