1+11+21+31+41+51+61+71+81+9

来源:学生作业帮助网 编辑:作业帮 时间:2018/12/10 22:58:27
1+11+21+31+41+51+61+71+81+91+11+21+31+41+51+61+71+81+91+11+21+31+41+51+61+71+81+93781+11+21+31+41+51

1+11+21+31+41+51+61+71+81+9
1+11+21+31+41+51+61+71+81+9

1+11+21+31+41+51+61+71+81+9
378

1+11+21+31+41+51+61+71+81+9 =(9+1)+(10+20+30+40+50+60+70+80)+1×8=10+10(1+2+3+4+5+6+7+8)+8=370+8=378

原式=10(1+2+3+4+5+6+7+8)+10+7
=377

1+11+21+31+41+51+61+71+81+9 1+11+21+31+41+51+61+71+81+91= 11,21,31,41,51,61,71,81,91.素数有那些 11,21,31,41,51,61,71,81,91.合数有哪些 计算 (1/11+1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+1/51)*(1/21+1/31+1/41) (1/11+1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+1/51)*(1/21+1/31+1/41)老师要方法啊. (1/11+1/21+1/31++1/41)*(1/21+1/31++1/41+1/51)-(1/11+1/21+1/31+1/41+1/51)*(1/21+1/31+1/41)=? (1/11+1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+/51)*(1/21+1/31+1/41) 求《水浒传》1-10、11-20、21-30、31-40、41-50、51-60、61-70、71-80回的8篇读书笔记200字+读后感100字. 31*51,41*61,81*21,91*31,71*41,81*81的简便算法 (1/11+1/20+1/31+1/40)*(1/21+1/30+1/41+1/50)-(1/11+1/21+1/31+1/41+1/51)*(1/21+1/31+1/41)=? 11,21,23,29,31,37,41,43,51,61,71,79,91,97中哪些是素数,哪些是合数 计算一个算式今天要!(两行都是)(11/1+21/1+31/1+41/1)*(21/1+31/1+41/1+51/1)-(11/1+21/1+31/1+41/1+51/1)*(21/1+31/1+41/1+) 计算一个算式今天要!(两行都是)(11/1+21/1+31/1+41/1)*(21/1+31/1+41/1+51/1)-(11/1+21/1+31/1+41/1+51/1)*(21/1+31/1+41/1+)错了,分母是分子,分子是分母 (1+11+21+31+41+51+1+71+81+91)+(9+19+29+39+49+59+69+79+89+99) 1 {1/11+1/21+1/31+1/41}*{1/21+1/31+1/41+1/51}-{1/11+1/21+1/31+1/41+1/51}*{1/21+1/31+1/41}2 31*167/158+167*127/1583 有300克面粉,还有两个重量分别为5克和30克的砝码.现在将这300克平均分成三份只用一台天平 1 2 5 14 ( )选项如下:A 31 B 41 C 51 D 61 小学简便方法运算!1.(17/11+18/21+19/31+20/41)×(18/21+19/31+20/41+21/51)-(17/11+18/21+19/31+20/41+21/51)×(18/21+19/31+20/41)2.3/(1×5)+3/(5×9)+3/(9×13)+3/(13×17)+…+3/(17×21)3.5/6-7/12+9/20-11/30+13/42