(3а²)⁴ ×(3а⁴)⁻⁴=81а⁸×3⁻⁴×а⁻¹⁶=3⁴×а⁸×1/3⁴×а⁻¹⁶=а⁸×а⁻¹⁶=а⁻⁸=1/а⁸
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(3а²)⁴ ×(3а⁴)⁻⁴=81а⁸×3⁻⁴×а⁻¹⁶=3⁴×а⁸×1/3⁴×а⁻¹⁶=а⁸×а⁻¹⁶=а⁻⁸=1/а⁸