简便计算(1/2+1/4+1/6+1/8)-(1/3+1/6-查字典问答网
分类选择

来自崔武成的问题

  简便计算(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20

  简便计算

  (1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20

1回答
2020-04-2623:09
我要回答
提示:回答问题需要登录哦!
马鸿飞

  (1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20)

  =1/2(1+1/2+1/3+1/4)-1/3(1+1/2+1/3+1/4)+1/4(1+1/2+1/3+1/4)-1/5(1+1/2+1/3+1/4)

  =(1/2-1/3+1/4-1/5)(1+1/2+1/3+1/4)

  =(1/6+1/20)(1+6/12+4/12+3/12)

  =13/60*25/12

  =65/144

2020-04-26 23:12:33
大家都在问
最新问答