2/1+6/5+12/11+20/19+30/29+.......+9702/9701+9900/9899百度了都没有,只有自己提问,方便大家嘛! 我已经没分了,请大家帮帮忙!
打反了,应该是1/2 5/6 .........
2\/1+6\/5+12\/11+20\/19+30\/29+...+9702\/9701+9900\/9899
1 5 11 9899 原式=---+---+---、、、--- 1×2 2×3 3×4 99×100 然后每个分式变成1-分式 转换成=99-后面的跟第三个回答一样 结果是99.01
2\/1+6\/5+12\/11+20\/19+30\/29···9702\/9701+9900\/9899进行简算_百度...
2\/1+6\/5+12\/11+20\/19+30\/29···9702\/9701+9900\/9899 =99-(2\/1+6\/1+12\/1+20\/1+30\/1+……+9702\/1+9900\/1)=99-(1-2\/1+2\/1-3\/1+3\/1-4\/1+4\/1-5\/1+5\/1-6\/1+……+98\/1-99\/1+99\/1-100\/1)=99-(1-100\/1)=98又100\/1 =98.01 ...
...分之19+30分之29+42分之41+...9702分之9701+9900分之9899=_百度知 ...
设项数为n n(n+1)=9900 (n-100)(n+99)=0 n1=100 n2=-99 (不合题意舍去)2分之1+6分之5+12分之11+20分之19+30分之29+42分之41+...9702分之9701+9900分之9899 =1-1\/2+1-1\/6+1-1\/12+...+1-1\/9900 =1X100-(1\/2+1\/6+1\/12+...+1\/9900)=100-(1-1\/2+1...
2\\1+6\\5+12\\11+20\\19+30\\29...+9900\\9899
2\/1+6\/5+12\/11+20\/19+30\/29···9702\/9701+9900\/9899 =99-(2\/1+6\/1+12\/1+20\/1+30\/1+……+9702\/1+9900\/1)=99-(1-2\/1+2\/1-3\/1+3\/1-4\/1+4\/1-5\/1+5\/1-6\/1+……+98\/1-99\/1+99\/1-100\/1)=99-(1-100\/1)=98又100\/1 =98.01 ...
...之5+12分之11+20分之19+。。。+9702分之9701+9900分之9899要过程_百...
2分之1+6分之5+12分之11+20分之19+。。。+9702分之9701+9900分之9899 =(1-1\/2)+(1-1\/6)+(1-1\/12)+(1-1\/20)+...+(1-1\/9702)+(1-1\/9900)=-(1\/2+1\/6+1\/12+1\/20+...+1\/9702+1\/9900)+99*1 =-[1\/(1*2)+1\/(2*3)++1\/(3*4)+1\/(4*5)+...+1\/(98...
1\/2+5\/6+11\/12+19\/20+29\/30+...+ 9701\/9702+9899\/9900 用简便方法计 ...
99\/100
计算1\/2+5\/6+11\/12+19\/20+29\/30...+9701\/9701+9899\/9900
原式有误,应该为:1\/2+5\/6+11\/12+19\/20+29\/30...+9701\/9702+9899\/9900 =(1-1\/2)+(1-1\/6)+(1-1\/12)+(1-1\/20)+(1-1\/30)+...+(1-1\/9506)+(1-1\/9900)2=1×2,6=2×3,12=3×4,20=4×5,30=5×6,...9701=98×99,9900=99×100,每个分数分解后的较小...
...5 +12分之11 +20分之19………9702分之9701 +9900分之9809的得数...
2分之1+ 6分之5 +12分之11 +20分之19………9702分之9701 +9900分之9809 =99-(1\/2+1\/6+1\/12+1\/20+……+1\/9702+1\/9900)=99-(1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+……+1\/98-1\/99+1\/99-1\/100)=99-(1-1\/100)=98.01 ...
1\/2+5\/6+11\/12+19\/20+29\/30+……+9701\/9702+9899\/9900 有解题分析...
原式=(1-1/2)+(1-1/6)+...+(1-1/9900) =99-(1/2+1/6+...+1/9900) =99-(1/1×2+1/2×3...
1\/2+5\/6+11\/12+19\/20+29\/30+...+9701\/9702+9899\/9900
比如9899\/9900=1-1\/9900 29\/30=1-1\/30 第一项分母2=1*2 第二项分母6=2*3 最后一项分母9900=99*100 所以总共由99项 所以原题=99-(1\/2+1\/6+1\/12+1\/20+1\/30+……+1\/9900 )而 1\/2+1\/6+1\/12+1\/20+1\/30+……+1\/9900 =1-1\/2+1\/2-1\/3+1\/4-1\/5+1\/5-1\/6+…...