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Tohaina

81\pi -3\times 3\pi \times 2
Whakareatia te 9 ki te 9, ka 81.
81\pi -9\pi \times 2
Whakareatia te 3 ki te 3, ka 9.
81\pi -18\pi
Whakareatia te 9 ki te 2, ka 18.
63\pi
Pahekotia te 81\pi me -18\pi , ka 63\pi .