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2014-10-23T19:30:16+03:00
A=( 3 ²¹+3 ²°+3 ¹⁹) : 39=3¹⁹(3²+3¹+3°):39=3¹⁹*13:39=3¹⁸*3*13:39=3¹⁸=(3⁹)²este pătrat perfect
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