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It is not possible to list all the expressions since there are infinitely many.
Start with the simple ones:

1.2+1.3, 1.1+1.4, 1.0+1.5, ... 0.1+2.4, 0.0+2.5, -0.1+2.6, ...
Then there are numbers with 2 decimal places, such as 1.24 + 1.26

and then ones with 3 dp, 4 dp, ... , infinitely many dp.
Next, you can consider sums of 3 numbers (0.8+0.8+0.9 and so on), of 4 numbers, of 5 numbers, ...

And you have not even begun to consider numbers that multiply to 2.5 of whose quotient is 2.5; and then there are powers, and trigonometric expressions.

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10y ago
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Q: What are all of the expressions that are equal to 2.5?
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