For example:

12345+6

1234+56

123+456

12+3456

1+23456

1? +356

If there are two plus signs, the problem is solvable. 1? +3+56=60, 1? Is the cubic of 1, that is, 1X 1= 1.

Extended data

Addition and subtraction algorithm

1, integer:

(1) Same number alignment

(2) Counting from the unit

(3) When it is added to dozens, it will be pushed to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.

2. Decimal number:

(1) decimal point alignment (that is, same digit alignment);

(2) calculation according to the law of integer addition and subtraction;

(3) Align the decimal point on the horizontal line of points and point the decimal point.