If two rational numbers are added, is the sum greater than each addend? If two rational numbers are subtracted, is the difference less than the subtracted? Please explain the reason
Not necessarily, for example
-1 + (- 1) = - 2, and - 2 are smaller than the addend - 1
-1 - (- 1) = 0, the difference 0 is larger than the subtraction - 1
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