Замените X так, чтобы получились верные равенства:
а) 3¹⁰- 1 = (3ˣ-1)(3ˣ+1)
б) 25¹⁴- 9 = (5ˣ-3)(5ˣ+3)
в) 49¹⁷- 4 = (7ˣ+2)(7ˣ-2)
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