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2010-02-25T15:02:41+01:00
8¹₅₋4⁵₆ = 41/5 - 29/6 = 246/30 - 145/30 = 101/30 = 3¹¹/₃₀

5²₇₋1⁹₂₁ = 37/7 - 30/21 = 111/21 - 30/21 = 81/21 = 3⁶/₇

6¹₁₆₋2⁹₄₀ = 97/16 - 89/40 = 485/80 - 178/80 = 307/80 = 3⁶⁷/₈₀

3¼⁻2⁵₁₈ = 13/4 - 41/18 = 117/36 - 82/36 = 35/36
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