1\/2×1\/6+1\/2怎么简便运算?
1\/2×1\/6+1\/2 =1\/2×(1\/6+1)=1\/2×7\/6 =7\/12 简便计算是一种特殊的计算,它运用了运算定律与数字的基本性质,从而使计算简便,使一个很复杂的式子变得很容易计算出得数。定律 乘法分配律 简便计算中最常用的方法是乘法分配律。乘法分配律指的是ax(b+c)=axb+axc其中a,b,c是任意实数...
二分之一乘以六分之一加十二分之一加上二十分之一加三十分之一用简便...
1\/2×1\/6+1\/12+1\/20+1\/30 =1\/12+1\/12+3\/60+2\/60 =5\/60+5\/60+3\/60+2\/60 =15\/60 =0.25。
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
最后就只有:1\/2+1\/2-1\/10=9\/10
1\/2+1\/6+1\/12+...+1\/90。怎么简便计算?
解答:1\/2+1\/6+1\/12+……+1\/90 =(1-1\/2)+(1\/2-1\/3)+(1\/3-1\/4)+……(1\/9-1\/10)=1-1\/2+1\/2-1\/3+1\/3-1\/4+……+1\/9-1\/10 =1-1\/10 =9\/10 这就是本题的计算结果,主要通过裂项法,达到了简便运算的目的。好了,本题已为您解答完毕,如还有疑问,欢迎在...
1\/2+1\/6+1\/12+...+1\/110用简便算法?
列项相消法:每一项拆开来比如1\/2=1-1\/2。1\/6=1\/2-1\/3。1\/12=1\/3-1\/4。以此类推。最后消完原式就等于1-1\/11=10\/11
“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\/72 简便运算,急!!!
简便运算方法如下图,把分母拆分后计算
用简便算法算:1\/2+1\/6+1\/12+1\/20=
2017-06-04 1+1\/2+1\/6+1\/12+1\/20用简便计算怎么算? 2 2016-03-31 1\/2+1\/6+1\/12+1\/20+1\/30简便计算 19 2015-03-27 1\/2+1\/6+1\/12+1\/20+1\/30+1\/42怎么算 100 2015-07-02 1\/2+1\/6+1\/12+1\/20+...+1\/90简... 23 2015-05-21 小学六年级数学,1\/2+1\/6+1\/12+...
1\/2 1\/6 1\/12 1\/20 1\/30 1\/42怎么用简便运算
1\/2+1\/6+1\/12+1\/20+1\/30+1\/42 =(1-1\/2)+(1\/2-1\/3)+(1\/3-1\/4)+(1\/4-1\/5)+(1\/5-1\/6)+(1\/6-1\/7)=1-1\/2+1\/2-1\/3+1\/3-1\/4+1\/4-1\/5+1\/5-1\/6+1\/6-1\/7 =1-(1\/2-1\/2)-(1\/3-1\/3)-(1\/4-1\/4)-(1\/5-1\/5)-(1\/6-1...
1\/2+1\/6+1\/12+1\/20+1\/30+1\/42+1\/56+1\/72+1\/90怎么简便计算?
=1\/(1*2)+1\/(2*3)+1\/(3*4)+1\/(4*5)+1\/(5*6)+1\/(6*7)+1\/(7*8)+1\/(8*9)+1\/(9*10)=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\/9+1\/9-1\/10 =1-1\/10 =9\/10 裂项法,是分解与组合思想在数列求和中的具体应用。是...