2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=?有什么规律,怎么算的.
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2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=?有什么规律,怎么算的.
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=?
有什么规律,怎么算的.
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=?有什么规律,怎么算的.
(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+(10*11)/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)+(10/1-11/1)
=1-11/1
=11/10
4,6,8,10,12,。。。等差数列,想想高斯,首尾相加,乘个数,除以2。还有如果是1/2+1/6+...+1/110=的话,
变化为1/1*2+1/2*3+...+1/10*11=1/1-1/2+1/2-1/3+...+1/10-1/11=1-1/11=10/11
ok好好学,你还得练啊
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2,-1/6,1/12,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1+1/2+1/6+1/12+1/20+1/30.+1/901+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=