2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

学习 时间:2026-09-27 23:01:41 阅读:5260
2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

最佳回答

魔幻的小懒猪

舒适的衬衫

2026-09-27 23:01:41

=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~~