1728 = 729 × 2(q2) + 270(r2)

729 = 270 × 2(q3) + 189(r3)

270 = 189 × 1(q4) + 81(r4)

Q0 = 空, Q1 = 天元一, q2 = 2

r2 = 270

Q2 = q2 = 2, q3 = 2

r3 = 189

Q3 = q3Q2 + Q1 = 5, q4 = 1

r4 = 81

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