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numbers and algebraic expressions
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elements of statistics
kropki game
Calculate powers sum and difference of square roots by short multiplication formulas: (square root of 2 - 5)(square root of 2 + 5), (square root of 3 - square root of 2)(square root of 3 + square root of 2), (3 * square root of 5 + 4)(3 * square root of 5 - 4).