1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50=
问题描述:
1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50=
列梯等式谢谢
急
答
1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50=48*51÷(4*49*50)=306/1225