Step 1: According to the knowledge of mathematics,

(1) A positive number is multiplied by a positive number, and the result is a positive number, that is, greater than 0;

② The result of multiplying a negative number by a negative number is also a positive number, greater than 0;

(3) positive multiplied by negative, the result is negative, less than 0;

Step 2: The writing of continuous multiplication in excel is: product (area)

draw

You can continue to communicate if necessary!