A rational number is multiplied by its opposite number, and the product is () A. Positive number B. Negative numbers C. Positive or 0 D. Negative or 0

A rational number is multiplied by its opposite number, and the product is () A. Positive number B. Negative numbers C. Positive or 0 D. Negative or 0

An inverse number of a positive number is a negative number whose product is a negative number;
The opposite of 0 is 0, their product is 0;
The opposite of a negative number is a positive number whose product is negative.
Therefore, D.

An inverse number of a positive number is a negative number whose product is a negative number;
The opposite number of 0 is 0 and their product is 0;
The opposite of a negative number is a positive number whose product is negative.
Therefore, D.

An inverse number of a positive number is a negative number whose product is negative;
The opposite of 0 is 0, their product is 0;
The opposite of a negative number is a positive number whose product is negative.
Therefore, D.

The product of a rational number and its opposite must be () A. Integer B. Negative number C. Non-positive number D. Non-negative number The product of a rational number and its inverse must be () A. Integer B. Negative number C. Non-positive number D. Non-negative number

C. Non-positive
A rational number consists of zero and non-zero rational numbers whose opposite numbers must also be zero and non-zero rational numbers.
When 1) is 0, the product of its opposite number must be 0;
2) If it is not 0, there must be 1 negative number and 1 positive number, positive number * negative number = negative number;
Therefore, the product of a rational number and its inverse number must be

C. Non-positive
A rational number consists of zero and non-zero rational numbers whose opposite numbers must also be zero and non-zero rational numbers.
When 1) is 0, the product of its opposite number must be 0;
2) If it is not 0, there must be 1 negative number and 1 positive number, positive number * negative number = negative number;
Therefore, the product of a rational number and its inverse must be (non-normal)