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An irrational number can't be expressed in the form of p/q. But here -3.125 can be expressed as -3125/1000(a rational number).
Also a rational number is a real number that canexpressed as terminating or repeating decimals. It is clear that -3.125 is a terminating decimal.
So, -3.125 is a rational number.
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∙ 13y ago
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