1又1/2+2又1/6+3又1/12+4又1/20+5又1/30+6又1/42+7又1/56+8又1/72+9又1/90

1+2又1\/6+3又1\/12+4又1\/20+5又1\/30+6又1\/42+7又1\/56+8又1\/72+9又1...
你好 原式=1+（2+1\/6）+（3+1\/12）+...+（9+1\/90）=（1+2+...+9）+（1\/6+1\/12+...+1\/90）=（1+9）*9\/2+[（1\/2-1\/3）+（1\/3-1\/4）+...+（1\/9-1\/10）]=45+[1\/2-1\/10]=45+2\/5 =45又2\/5 【数学辅导团】为您解答，不理解请追问，理解请及时选为满意...

1+2又1\/6+3又1\/12+4又1\/20+5又1\/30+6又1\/42+7又1\/56+8又1\/72
1+2又1\/6+3又1\/12+4又1\/20+5又1\/30+6又1\/42+7又1\/56+8又1\/72  我来答 1个回答 #活动# 百度知道那些年,你见过的“奇妙”问答?小雁塔小学 2016-03-06 · 知道合伙人教育行家 小雁塔小学 知道合伙人教育行家 采纳数:3144 获赞数:38474 小学一级教师,区优秀教师。教学经验丰富,多次参...

1又1\/2+3又1\/6+5又1\/12+7又1\/20+9又1\/42+11又1\/56+13又1\/72+15又1...
1又1\/2+3又1\/6+5又1\/12+7又1\/20+9又1\/42+11又1\/56+13又1\/72+15又1\/90 =(1+3+5+7+9+11+13+15)+(1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/56+1\/72+1\/90-1\/30)= 64+1\/(1*2 )+1\/(2*3 )+1\/(3*4) +1\/(4*5)+1\/(5*6)+1\/(6*7)+1\/(7*8)+1\/(8*...

1又1\/20+2又1\/30+3又1\/42+4又1\/56+5又1\/72+6又1\/90+7又1\/110=?
先把整数部分相加，是一个等差数列。即1+2+3+……+7=（1+7）*7*1\/2=28 再解决分数部分,1\/20=1\/4-1\/5 1\/30=1\/5-1\/6 以后同理,所以分数部分化简为1\/4-1\/5+1\/5-1\/6+1\/6-1\/7+……+1\/10-1\/11=1\/4-1\/11=7\/44 故结果为28又7\/44 ...

1又1\/20+2又1\/30+3又1\/42+4又1\/56+5又1\/72+6又1\/90+7又1\/110+8又1\/1...
=1+2+3+4+5+6+7+8+1\/20+1\/30+...+1\/132 =36+1\/4-1\/5+1\/5-1\/6+1\/6-1\/7...+1\/11-1\/12 =36+1\/4-1\/12 =36+1\/6

1又1\/2+2又1\/6+3又1\/12+4又1\/20+5又1\/30+6又1\/42+7又1\/56等于多少?
（1+2+3+4+5+6+7）+（1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/56）=28+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 =28+1-1\/8 =28又7\/8 请采纳，你的采纳是我上进的动力！可以追问，一直到懂！!

1又1\/2+3又1\/6+5又1\/12+7又1\/20+9又1\/42+11又1\/56+13又1\/72+
=（1+3+..+15）+（1\/2+1\/2-1\/3+1\/3-1\/4+..+1\/9-1\/10）=64+1-1\/10=65-1\/10=64又9\/10

1.求1又1\/2-2又5\/6+3又1\/12-4又19\/20+5又1\/30-6又41\/42+7又1\/56-8又...
1、1又1\/2-2又5\/6+3又1\/12-4又19\/20+5又1\/30-6又41\/42+7又1\/56-8又71\/72+9又1\/90 =（1-3+3-5+5-7+7-9+9）+（1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/56+1\/72+1\/90 =1+（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\/8...

...1又1\/2-2又5\/6+3又1\/12-4又19\/20-5又1\/30+6又41\/42-7又1\/56+8又...
1又1\/2-2又5\/6+3又1\/12-4又19\/20+5又1\/30-6又41\/42+7又1\/56-8又71\/72+9又1\/90 =(1+1\/2)+(-3+1\/6)+(3+1\/12)+(-5+1\/20)+(5+1\/30)+(-7+1\/42)+(7+1\/56)+(-9+1\/72)+(9+1\/90)=1-3+3-5+5-7+7-9+9+1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/...

这道题怎么简算
1又1\/2+2又1\/6+3又1\/12+4又1\/20+5又1\/30 =(1+1\/2)+(2+1\/6)+（3+1\/12）+（4+1\/20）+(5+1\/30)=1+2+3+4+5+[(1-1\/2)+(1\/2-1\/3)+（1\/3-1\/4）+（1\/4-1\/5）+（1\/5-1\/6]=15+1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+1\/5-1\/6 =15+5\/6 =15...