The product of a rational number multiplied by its opposite number is () A. Positive number B. negative number C. positive number or 0d. Negative number or 0

The product of a rational number multiplied by its opposite number is () A. Positive number B. negative number C. positive number or 0d. Negative number or 0

The opposite number of a positive number is negative and its product is negative; the opposite number of 0 is 0 and its product is 0; the opposite number of a negative number is positive and its product is negative

The product of a rational number and its opposite number must be () A. integer B. negative number C. non positive number D. non negative number

C. Non positive number
Rational numbers contain 0 and non-0 rational numbers, and their opposite numbers must be 0 and non-0 rational numbers,
1) When it is 0, the product of it and its opposite number must be 0;
2) If it is not zero, it must have one negative number and one positive number, and positive number * negative number = negative number;
Therefore, the product of a rational number and its opposite number must be (non positive number)

If the product of 100 rational numbers is negative, how many possibilities are there for the number of negative factors?

One, three, five. 99
There are 50 possibilities

If the number of negative factors is odd,

If there is 0 in several rational numbers, it is not right
If not, it's right