2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

学习 时间:2026-09-28 02:04:09 阅读:3292
2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

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苗条的红牛

魔幻的菠萝

2026-09-28 02:04:09

=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15=1-1/15=14/15 再问: 不太懂~~