5/6-7/12+9/20-11/30+13/42-15/56+17/72

5\/6-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72,
5\/6－7\/12＋9\/20－11\/30＋13\/42－15\/56＋17\/72 =（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\/9)=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\/9 =1\/2+1\/9 =11\/18 ...

6分之5减12分之7加20分之9减30分之11加42分之13减56分之15加72分之17...
你好！5\/6 - 7\/12 + 9\/20 - 11\/30 + 13\/42 - 15\/56 + 17\/72 = (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\/9)= 1\/2 + 1\/9 （中间的全部抵消了）= 11\/18 答案：18分之11 ...

计算:5\/6+7\/12+9\/20+11\/30+13\/42+15\/56+17\/72+19\/90= 请将详细的计算过...
原式=（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\/9）+（1\/9+1\/10）我就提示到这里，剩下的可以自己解决了

...减三十分之十一加四十二分之十三减五十六分之十五加七十二分之十七是...
5\/6-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 解=10\/12-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =3\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =1\/4+9\/20-11\/30+13\/42-15\/56+17\/72 =5\/20+9\/20-11\/30+13\/42-15\/56+17\/72 =14\/20-11\/30+13\/42-15\/56+17\/72 =7\/10-...

观察,你能有什么发现?并用你的发现计算下面这道题,在线等,谢谢!_百度...
5\/6-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72-19\/90 =(1\/2+1\/3)-(1\/3+1\/4)+(1\/4+1\/5)+...-(1\/9+1\/10)=1\/2-1\/10 =2\/5

1-5\/6+7\/12-9\/20+11\/30-13\/42+15\/56-17\/72登月多少,用简便方法_百度知 ...
2012-06-26 小学数学题解答1-5\/6+7\/12-9\/20+11\/30-1... 6 2005-09-06 1-5\/6+7\/12-9\/20+11\/30-13\/42+15... 46 2015-02-08 1-5\/6+7\/12-9\/20+11\/30-13\/42+15... 4 2011-09-14 1-5\/6+7\/12-9\/20+11\/30-13\/42+15... 60 2016-12-27 1-5\/6+7\/12-9\/20+11...

5\/6减7\/12加9\/20减11\/30加13\/42减15\/56加17\/72等于多少?
三十六分之十九

5\/6-7\/12+9\/20-11\/30+13\/42-15\/56
第二个份数好像错了，是不是这样： 1\/2+5\/6-7\/12+9\/20-11\/30+13\/42-15\/56 =1\/2+（2+3）\/（2*3）-（3+4）\/（3*4）+（4+5）\/（4*5）-（5+6）\/（5*6）+（6+7）\/（6*7）-（7+8）\/（7*8） =1\/2+1\/2+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1...

5\/6-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72-19\/90=
5\/6-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72-19\/90 =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\/9-(1\/9+1\/10)=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\/9-1\/9-1\/10 =1\/2-1\/10 =5\/10...

简便计算 1-5\/6+7\/12-9\/20+11\/30-13\/42+15\/56-17\/72
1-5\/6+7\/12-9\/20+11\/30-13\/42+15\/56-17\/72 =1-(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\/9)=1-1\/2-1\/9 =1\/2-1\/9 =9\/18-2\/18 =7\/18