1/2+1/6+1/12+1/20+1/30+1/3+1/50简便计算?

如题所述

第1个回答  2020-06-04
1/2+1/6+1/12+1/20+1/30+1/3+1/50
=1/2+1/20+1/30+1/3+1/50+1/6+1/12
=11/20 + 11/30 + 1/50 + 1/4
=33/60+ 22/60 + 4/200 + 50/200
= 44/60 + 54/200
=444/600 +162/600
=606/600
= 303/300
= 1又3/300
第2个回答  2020-06-05
=1/2+1/(2×3)+1/(3x4)+……+1/(6x7)+1/(7×8)
=1/2+1/2-1/3+1/3-1/4+1/4-1/5+……-1/7+1/7-1/8
=1-1/8
=7/8

1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/52(用简便方法计算)
用短除法先计算出分母的最小公倍数,将上述算式乘以最小公倍数,计算出来后再除以最小公倍数。= =!

1\/2+1\/6+1\/12+1\/20+1\/30+...?
所以1\/2+1\/6+1\/12+1\/20+1\/30+.+1\/9900简便运算最后的结果是99\/100。

二分之一加六分之一加十二分之十一加二十分之一加三十分之一加四十二...
1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/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 =7\/8

1\/2+1\/6+1\/12+1\/20+1\/30=简便计算。
1\/2+1\/6+1\/12+1\/20+1\/30简便计算结果为5\/6。解:1\/2+1\/6+1\/12+1\/20+1\/30 =1\/(1x2)+1\/(2x3)+1\/(3x4)+1\/(4x5)+1\/(5x6)=(1-1\/2)+(1\/2-1\/3)+(1\/3-1\/4)+(1\/4-1\/5)+(1\/5-1\/6)=1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+1\/5-1\/6 =1-1\/6 ...

1\/2+1\/6+1\/12+1\/20+1\/30怎么简便算啊
这种题型有一个固定的方法:裂项相加法(把一个项裂开成两个项)解:1\/2+1\/6+1\/12+1\/20+1\/30 =1\/(1×2)+1\/(2×3)+1\/(3×4)+1\/(4×5)+1\/(5×6)=1\/1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+1\/5-1\/6 =1-1\/6 =1\/5 ...

“1\/2+1\/6+1\/12+1\/20+1\/30”怎样用简便方法计算?
计算过程如下:1\/2+1\/6+1\/12+1\/20+1\/30 =1\/(1x2)+1\/(2x3)+1\/(3x4)+1\/(4x5)+1\/(5x6)=(1-1\/2)+(1\/2-1\/3)+(1\/3-1\/4)+(1\/4-1\/5)+(1\/5-1\/6)=1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+1\/5-1\/6 =1-1\/6 =5\/6 分数性质:一个分数不是有限小数,就...

1\/2+1\/6+1\/12+1\/20+1\/30怎样用简便方法计算
根据基本裂项公式:可知:一、定义:裂项法,这是分解与组合思想在数列求和中的具体应用。是将数列中的每项(通项)分解,然后重新组合,使之能消去一些项,最终达到求和的目的。 通项分解(裂项)倍数的关系。二、其他裂项法公式:

1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/56+1\/72+1\/90简便运算怎么做
原式 =1\/2+(1\/2-1\/3)+(1\/3-1\/4)+.+(1\/8-1\/9)+(1\/9-1\/10)=1\/2+1\/2-1\/10 =9\/10 把括号去掉,你就会发现前一项的后一部分和后一项的前一部分消掉,最后就只有:1\/2+1\/2-1\/10=9\/10

1\/2+1\/6+1\/12+1\/20+1\/30+1\/42的简便运算。
1\/2+1\/6+1\/12+1\/20+1\/30+1\/42 =1\/(1x2)+1\/(2x3)+1\/(3x4)+1\/(4x5)+1\/(5x6)+1\/(6x7)=(1 -1\/2) +(1\/2-1\/3)+...+(1\/6-1\/7)=1 -1\/7 =6\/7 异分母分数相加:1、异分母分数相加,先通分,再按同分母分数相加法去计算,最后要化成最简分数。例1:3\/4+5\/7...

...加12分之一加20分之一加30分之一 一步一步算, 简便计算
1\/2+1\/6+1\/12+1\/20+1\/30 =30\/60+10\/60+5\/60+3\/60+2\/60 =50\/60 =5\/6

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