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[∛(91125/19683 )- ∛(3375/5832 ) ] × ∛(512/9261) = ? - √(484/3969) (45/27- 15/18) × 8/21 = ? - 22/63 (5/3- 5/6) × 8/21 = ? - 22/63 5/6 ×8/21 =? - 22/63 20/63 + 22/63 = ? ? = 42/63 = 2/3
8, 27, 53, ?, 161, 285
13 19 32 52 ? 113
250 Â Â Â 25 Â Â Â Â 5 Â Â Â Â ? Â Â Â Â 0.6 Â Â Â Â Â 0.3
70, 95, 145, ?, 320, 445
26, 227, 628, 1229, ?, 3031
81, 41, 42, 64.5, ?, 330
7   4   5   9   20    ?    160.5
[(145)² ÷ 25 × 52] ÷ ? = 29 × 13
47, 72, 122, ?, 297, 422
45, 59, 31, ?, 17, 87