早教吧作业答案频道 -->数学-->
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.1/39X1/40
题目详情
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.1/39X1/40
▼优质解答
答案和解析
很高兴为您解答!
原式=1/2-1/3-1/3+1/4-1/4+1/5-1/5+1/6.1/39+1/40
=1/2-2/3+1/40
=-17/120
原式=1/2-1/3-1/3+1/4-1/4+1/5-1/5+1/6.1/39+1/40
=1/2-2/3+1/40
=-17/120
看了 1/2X1/3-1/3X1/...的网友还看了以下：