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Consider the following expressions : ...

`Consider the following expressions : 1. `x+x^(2)- 1/x` 2.`sqrt(ax^(2) + bx + x - c + d/c - e / x^(2))` 3. `3x^(2) - 5 x + ab` 5 `1/x - 2/ (x+5)` Which of the above are rational expressions ?

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