1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3Q!
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1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3Q!1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3
1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3Q!
1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?
快啊~~急!最后3Q!
1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3Q!
(1+23)*6+(1+19)*5+21=265
1+3+5+7+···+21+23+21+19+17+···+7+5+3+1=?快啊~~急!最后3Q!
将奇数按如下排列 1 5 7 19 21··· 3 9 17 23··· 11 15 25··· 13 27··· 29··· 2009在几排几
求下列数字方阵中所有数的和1,2,3,4,···,18,19,202,3,4,5,···,19,20,213,4,5,6,···,20,21,224,5,6,7,···,21,22,23···········20,21,22,23,···,37,38,39
计算:1/1·5+1/3·7+1/5·9+···+1/21·25
求3+5+7+9······+19+21+23+25+27的和
计算1/3×5+1/5×7+1/7×9+···+1/21×23,3×5是分母,5×7是分母,7×9是分母,···21×23是分母
简便计算:1*2分之1+2*3分之1+3*4分之1······+38*39分之1+39*40分之11*3分之1+3*5分之1+5*7分之1+······+19*21分之1+21*23分之1注意:分数是这样的1——1*2
1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````1+2+3+4+5+6+7+8+9+1+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28++29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50··································
1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26··· 17 1816 15 14 13 22 29···1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26···16 15 14 13 22 29·· ·17 18 19 20 21 30···36 35 34 33 32 31··· ·
2/1×3+2/3×5+2/5×7+···+2/19×21
序列 1 2 3 4 5 6 ······ n 对应的数 1 3 6 10 21······?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 .第n行最后一个数是( )第一行:第二行:23。第三行:456.第四行:7 8 9 10 ··············第n行最后一个数是多少。
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
简算:1*3分之1+3*5分之1+5*7分之1+······+19*21分之1
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
自然数按下列规律排列:求上起第13行左起第10列的数数127应该在上起第几行,左起第几列自然数按下列规律排列:1 4 9 16 25 ···2 3 8 15 24 ···5 6 7 14 23 ···10 11 12 13 22 ···17 18 19 20 21······
一串数1,1,1,2,2,3,4,5,7,9,12,16,21······称为帕多瓦数列谢谢
找规律:1,1,2,3,5,8,——,21,34,——················