1⼀1x2x3+1⼀2x3x4+1⼀3x4x5+1⼀4x5x6+......+1⼀48x49x50=

列梯等式 谢谢急
2024-12-20 16:08:29
推荐回答(1个)
回答1:

1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+......+1/48x49x50=48*51÷(4*49*50)=306/1225