数学问题1⼀1x2x3+1⼀2x3x4+.....1⼀48x49x50=?

2024-12-23 04:38:44
推荐回答(2个)
回答1:

=1/2x(1/1x2-1/2x3)+1/2x(1/2x3-1/3x4)+……+1/2x(1/48x49-1/49x50)
=1/2x(1/1x2-1/2x3+1/2x3-1/3x4+……+1/48x49-1/49x50)
=1/2x(1/1x2-1/49x50)
=306/1225

回答2:

1328.918

1328又412/449