Ответ:
(3х – 1)(3х + 1) – 4х² = 9x²+3x-3x-1-4x²=9x²-1-4x²= 5x²-1
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Ответ:
(3х – 1)(3х + 1) – 4х² = 9x²+3x-3x-1-4x²=9x²-1-4x²= 5x²-1