Mathematics, 18.10.2020 15:01 justttlearnnn12333
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4. Fie x, y, z trei numere reale astfel încât x + y +z=6. Arătaţi că cel puțin unul dintre
numere e mai mare sau egal ca 2, şi că cel putin unul dintre ele e mai mic sau egal ca 2.
5. Arătaţi că 19 nu poate fi scris ca o diferenţă de numere prime.
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4. Fie x, y, z trei numere reale astfel încât x + y +z=6. Ară...
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