1\/15+2\/15+……+13\/15+14\/15简算 跪求
=(1\/15+14\/15)+(2\/15+13\/15)+...+(7\/15+8\/15)=7
1\/15+2\/15+……+13\/15+14\/15简算
=(1\/15+14\/15)+(2\/15+13\/15)+...+(7\/15+8\/15)=7
13\/15-13\/14+2\/15-1\/14 怎么简算能简算吗?如果能。怎么简算、
=(13\/15+2\/15)-(13\/14+1\/14) =1-1 =0
十五分之一加三十五分之一加六十三分之一用脱式计算怎么简算?
十五分之一加三十五分之一加六十三分之一 =1\/15+1\/35+1\/63 =(2\/15+2\/35+2\/63)\/2 =(1\/3-1\/5+1\/5-1\/7+1\/7-1\/9)\/2 =(1\/3-1\/9)\/2 =(3\/9-1\/9)\/2 =2\/9\/2 =1\/9
跪求此简算题的解!1\/2+3\/22+4\/23+……11\/2十次方=??
设S=1\/2+3\/2^2+4\/2^3+……11\/2^10,则 (1\/2)S=1\/2^2+3\/2^3+……10\/2^10+11\/2^11,两式相减:S-(1\/2)S=(1\/2)+(2\/2^2)+1\/2^3+1\/2^4……1\/2^10-11\/2^11 (1\/2)S=(1\/2)+(1\/2)+[1\/2^3+1\/2^4……1\/2^10]-11\/2^11 (1\/2)S=1+[1\/2^3+1...
15分之一加12分之一怎样算的?
3分之一加15分之一加35分之一加63分之一省略号9999分之一 1\/3 + 1\/15 + 1\/35 + 1\/63 + …… + 1\/9999 = 1\/(1×3) + 1\/(3×5) + 1\/(5×7) + 1\/(7×9) + …… + 1\/(99×101) = (1\/2)(1 - 1\/3) + (1\/2)(1\/3 - 1\/5) + (1\/2)(1\/5 - ...
跪求等...列竖式,简算。
1)=3\/4×8\/15+3\/4×4\/9 =2\/5+1\/3 =11\/15 2)=1\/7×63-1\/9×63-2\/3 =9-7-2\/3 =1又1\/3 3)=4\/5×13\/15+2\/15×4\/5 =4\/5×(13\/15+2\/15)=4\/5×1 =4\/5 4)=24×1\/2+24×1\/3-24×1\/8 =12+8-3 =17 ...
1\/3+1\/15+1\/35+.+1\/143计算过程是什么?
计算过程如下:1\/3+1\/15+1\/35+1\/63+1\/99+1\/143 1\/3=1\/(1*3)=(1-1\/3)\/2;同理:1\/15=1\/(3*5)=(1\/3-1\/5)\/2 然后就得到 1\/3+1\/15+1\/35+1\/63+1\/99+1\/143 =1\/2(1-1\/3+1\/3-1\/5+1\/5-1\/7+1\/7-1\/9+1\/9-1\/11+1\/11-1\/13)=1\/2(1-1\/13)=1...
1+2+3+4+5……+15的简算方法如下
原式等于 (1+15)×15÷2 =16×15÷2 =120 回答完毕~有疑问请追问,我一定尽快回复你~无疑问请点击【采纳】,同时预祝学习进步~\\(^o^)\/~我不是学霸,叫我赌神~\\(^o^)\/~~\\(^o^)\/~~\\(^o^)\/~~\\(^o^)\/~