非常感谢1+1/3+1/6+1/10+1/15+1/21+1/36+1/45+1/55、它们的和是多少.

求分中……若满意还请采纳、1+1/3+1/6+1/10+1/15+1/21+1/36+1/45+1/55=9/6+1/10+1/15+1/21+1/36+1/45+1/55=16/10+1/15+1/21+1/36+1/45+1/55=25/15+1/21+1/36+1/45+1/55=36/21+1/36+1/45+1/55=12/7+1/36+1/45+1/55=12...