2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

学习 时间:2026-04-01 07:01:16 阅读:1768
2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

最佳回答

淡然的流沙

典雅的苗条

2026-04-01 07:01:16

=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~~