2/1+6/1+12/1+20/1+30/1+42/1+56/1 要式子/ 这个分数线!
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/25 15:39:57
![2/1+6/1+12/1+20/1+30/1+42/1+56/1 要式子/ 这个分数线!](/uploads/image/z/18126-54-6.jpg?t=2%2F1%2B6%2F1%2B12%2F1%2B20%2F1%2B30%2F1%2B42%2F1%2B56%2F1+%E8%A6%81%E5%BC%8F%E5%AD%90%2F+%E8%BF%99%E4%B8%AA%E5%88%86%E6%95%B0%E7%BA%BF%EF%BC%81)
xJ@_d?"Ń@"EzPiA<wn
NԃAv2Mg`j8܁A.(wEblYYޮ';&rG˒_p&(gw z]#M* $
"h̆̚p "D@
IEHF@ m8,Fֱsb9g)%jb˲yΛz4l0.s^@}U0M߉֮ۜߚwrK
2/1+6/1+12/1+20/1+30/1+42/1+56/1 要式子/ 这个分数线!
2/1+6/1+12/1+20/1+30/1+42/1+56/1 要式子
/ 这个分数线!
2/1+6/1+12/1+20/1+30/1+42/1+56/1 要式子/ 这个分数线!
1/2+1/6+1/12+1/20+1/30+1/42+1/56
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1+(-1/2+1/2)+(-1/3+1/3)+……+(-1/7+1/7)-1/8
=1-1/8
=7/8
像这种1/[n*(n+m)]=(1/m)[1/n-1/(n+m)]
这是常用的裂项法解题技巧的一种
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8=7/8
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2,-1/6,1/12,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1+1/2+1/6+1/12+1/20+1/30.+1/901+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=