1/3+1/6+1/10+1/15+1/21+1/28=?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 03:48:57
1/3+1/6+1/10+1/15+1/21+1/28=?
x)3767bCa $ AMR>v6(0B %H96p Z`4)oR ♃x sL4Z`gkd`YF@B!f g$Ao=P5tjyPp>T=iB';^]bZ߉DW

1/3+1/6+1/10+1/15+1/21+1/28=?
1/3+1/6+1/10+1/15+1/21+1/28=?

1/3+1/6+1/10+1/15+1/21+1/28=?
1/3+1/6+1/10+1/15+1/21+1/28
=1/3+1/2*1/3+1/2*1/5+1/3*1/5+1/3*1/7+1/4*1/7
=1/3*(1+1/2)+1/5*(1/2+1/3)+1/7*(1/3+1/4)
=1/3*3/2+1/5*5/6+1/7*7/12
=1/2+1/6+1/12
=6/12+2/12/1/12
=9/12
=3/4

1/3+1/6+1/10+1/15+1/21+1/28
=(1/3+1/6)+(1/10+1/15)+(1/21+1/28)
=1/2+1/6+1/12
=9/12
=3/4

1/3+1/6+1/10+1/15+1/21+1/28
=(1/3+1/6)+(1/10+1/15)+(1/21+1/28)
=1/2+1/6+1/12
=6/12+2/12+1/12
=3/4

上面说的对