[中學] 整數分群
S1 = 1
S2 = 2+3
S3 = 4+5+6
S4 = 7+8+9+10
S5 = 11+12+13+14+15
S6 = 16+17+18+19+20+21
....
以下類推
試求 S1+S3+S5+....+S11 = ?
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推
12/10 14:54, , 1F
12/10 14:54, 1F
→
12/11 15:13, , 2F
12/11 15:13, 2F
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