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If the sum of two rational numbers is positive, then the two numbers () A. Must be all positive B. Must be negative C. Must be non-negative D. At least one is positive
According to the law of addition of rational numbers, if the sum of two rational numbers is positive, then there are three cases of the two numbers: the same positive or a positive-negative and the absolute value of the positive number is greater than the absolute value of the negative or a positive number and 0. Obviously, at least one of the three cases is positive.
Therefore, D.
The following numbers, which are not rational numbers, are cycles C of () A,-3.14 B,0.5333333333, seven-thirds D, pi (infinite decimal)
D.π
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