[ ] ™ 1/2 ® [ ] [
] 1 ] 1]1⁄2 1⁄2

·| [ ]| 到 1/2 *| | [ ] 3/4 = 1/4| # 3/4 + 3| 到 = 1 3/4| [ 3/4 ] 1/2| [ ]| 到 o o| [ ]| [ o]| ·| • 1/2 = 1/2 ...| 到 [ ] 1| [ ] 1/2 2| ·| [ ] ®| [ ]| 到 3/4 *| [ ]| ·