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求一道分数的简便算法(1+1/2+1/3+······+1/60)+(2/3+2/4+······+2/60)+(3/4+3/5+······+3/60)+······+(58/59+58/60)+59/60

求一道分数的简便算法(1+1/2+1/3+······+1/60)+(2/3+2/4+······+2/60)+(3/4+3/5+······+3/60)+······+(58/59+58/60)+5

1/2+1/3+2/3+1/4+2/4+3/4+···+1/60+2/60+3/60+··59/60.

1/2+1/3+2/3+1/4+2/4+3/4+···+1/60+2/60+3/60+··59/60.1/2+1/3+2/3+1/4+2/4+3/4+···+1/60+2/60+3/60+··59/6

计算:1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+···+1/60+···59/60

计算:1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+···+1/60+···59/60计算:1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4

把这些数字由基数词变成序数词1·2·3·4·5·6·7·8·9·10·11·12·20·30·40·50·60·70·80·90·21·35·78

把这些数字由基数词变成序数词1·2·3·4·5·6·7·8·9·10·11·12·20·30·40·50·60·70·80·90·21·35·78把这些数字由基数词变成序数词1·2·3·4·5·6·7

计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)································································································

计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)························································

1+2-3+4+5-6+7+8-9+10+11-121······+58+59-60 (巧算)急!

1+2-3+4+5-6+7+8-9+10+11-121······+58+59-60(巧算)急!1+2-3+4+5-6+7+8-9+10+11-121······+58+59-60(巧算)急!1+2-

1+2-3+4+5-6+7+8-9+······+58+59-60用简便方法计算要可讲解

1+2-3+4+5-6+7+8-9+······+58+59-60用简便方法计算要可讲解1+2-3+4+5-6+7+8-9+······+58+59-60用简便方法计算要可讲解1+2-3+4+5-6+

1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?

1234·····7·······10········?1357·····?······?··········290149·····?······?··········?1234·····7·····

8+11+14+17+20+·······+305 数学计算题.呜呜呜1+2+3+4+···················+98+99+100+99+98+···············+3+2+1

8+11+14+17+20+·······+305数学计算题.呜呜呜1+2+3+4+···················+98+99+100+99+98+···············+3+2+18

观察下列表格,回答下面的问题(正反比例的意义)小学时间(小时) | 1 | 2 | 3 |4 | 5 | 6 | 7 | 8 |·······路程(千米) | 60|120|180|240|300|360|420|480|·······--------------------------

观察下列表格,回答下面的问题(正反比例的意义)小学时间(小时)|1|2|3|4|5|6|7|8|·······路程(千米)|60|120|180|240|300|360|420|480|·······

证明1·3·5·····(2n-1)/2·4·6·····2n

证明1·3·5·····(2n-1)/2·4·6·····2n证明1·3·5·····(2n-1)/2·4·6·····2n证明1·3·5·····(2n-1)/2·4·6·····2n分子是一个等差

2*4*6+4*8*12+8*16*24+······20*40*60如题

2*4*6+4*8*12+8*16*24+······20*40*60如题2*4*6+4*8*12+8*16*24+······20*40*60如题2*4*6+4*8*12+8*16*24+·····

从1、2、3、4······57、58、59、60这60个数中,第一次划去奇数位上的数,第二次再划去奇数位上的数····如此下去,最后剩下的数是几?

从1、2、3、4······57、58、59、60这60个数中,第一次划去奇数位上的数,第二次再划去奇数位上的数····如此下去,最后剩下的数是几?从1、2、3、4······57、58、59、60这

观察1/2 1/6 1/12 1/20 1/30·····的排列顺序,第60个数是多少?观察1/2 1/6 1/12 1/20 1/30··························的排列顺序,第60个数是多少?

观察1/21/61/121/201/30·····的排列顺序,第60个数是多少?观察1/21/61/121/201/30··························的排列顺序,第60个数是多少

-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················

-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················-128,64,-32,16,-8,4,-2,1,-½,···第n

2[4/3y—(2/3y—1/2)]=3/4y急·································!1

2[4/3y—(2/3y—1/2)]=3/4y急·································!12[4/3y—(2/3y—1/2)]=3/4y急·················

俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群

俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,····

1+2+3+4+5····+50

1+2+3+4+5····+501+2+3+4+5····+501+2+3+4+5····+501275

1+2+3+4·······+98+99等于多少

1+2+3+4·······+98+99等于多少1+2+3+4·······+98+99等于多少1+2+3+4·······+98+99等于多少1+2+3+4·······+98+99=(1+99)X

数列 1/2,3/2,1/3 ,4/3,·········1/n+1,n+2/n+1,·········是否有极限?

数列1/2,3/2,1/3,4/3,·········1/n+1,n+2/n+1,·········是否有极限?数列1/2,3/2,1/3,4/3,·········1/n+1,n+2/n+1,···