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4.25. Упростите выражение: 1) а - 3 + 6а + Na + 18а? + 81 при а 2 - 3; 2) 2х - 1+ 10x + 22 + ух" + 6x? +9 при х 2 - 5; + а + 2Na + 1 2а - + а - 1 а V2 3) 2 а а - 1 4) a2 +a 2 a²+2 а-2 a+ve х- у 5) у Nх - у х + ; 6) Na +1 vа - 1 va - Na +1 а) ( ). 2 + ху 4.26. Решите уравнение:
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