请网友帮忙解答这两道数学题.要详细过程.在线等答案.要简便计算
1/1*2+1/2*3+1/3*4+1/4*5.........+1/99*100("*"代表乘号,"/"代表分数线)1又1/2-5/6+7/12-9/20+11/30-...
1/1*2+1/2*3+1/3*4+1/4*5.........+1/99*100("*"代表乘号,"/"代表分数线)
1又1/2-5/6+7/12-9/20+11/30-13/42+15/56 展开
1又1/2-5/6+7/12-9/20+11/30-13/42+15/56 展开
展开全部
1/1*2+1/2*3+1/3*4+1/4*5.........+1/99*100
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/99-1/100
=1-1/100
=99/100
1又1/2-5/6+7/12-9/20+11/30-13/42+15/56
=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+1/8
=1又1/8
希望能帮到你,@数学辅导团# 祝你学习进步,不理解请追问,理解请及时采纳!(*^__^*)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/99-1/100
=1-1/100
=99/100
1又1/2-5/6+7/12-9/20+11/30-13/42+15/56
=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+1/8
=1又1/8
希望能帮到你,@数学辅导团# 祝你学习进步,不理解请追问,理解请及时采纳!(*^__^*)
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