Answer:
always
Explanation:
Rational numbers can be expressed as a fraction of two integers. So, adding two rationals is the same as adding two such fractions.
Always
If the irrational parts of the numbers have zero sum, the sum is rational. If not, the sum is irrational. It is true, for example, for 2 7, 3. It is false, for example, for3+2 5,−2 5 .
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