23+√81-52, -8, 4, -2, 12, √64+22, 8, 4, 66, 12, √640=80, Wrong, Right, π=?, 3.1415926825897932384626433832..., 3.1235926535897932384626433832..., 3.1415926535897932384626433832..., 3.1415926535897932384602933832..., e=?, 2.71828, 2.71820, 2.71728, 2.71822, 2.79172, 2.71836.

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