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8. Proof: Suppose r and s are rational numbers. Then a/b and s = c/d for some integers a, b, c, and d with 0

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8. "Proof: Suppose r and s are rational numbers. Then a/b and s = c/d for some integers a, b, c, and d with 0 and d 0 (by definition of rational). Then r b a C r+s=

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