1/2+1/6+12/+20/+30/+……+1/110=?
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1/2+1/6+12/+20/+30/+……+1/110=?
1/2+1/6+12/+20/+30/+……+1/110=?
1/2+1/6+12/+20/+30/+……+1/110=?
原式为可化为
1/1×2 + 1/2×3 + 1/3×4 + 1/4×5 +1/5×6 + ...+ 1/10×11
注意到:1/1×2=1-1/2
1/2×3=1/2-1/3
1/3×4=1/3-1/4
………………
1/10×11=1/10-1/11
故原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/10-1/11)
=1-1/2+1/2-1/3+1/3-1/4+...+1/10-1/11
=1-1/11
=10/11
1-1/11=10/11
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
1/2+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=
1/2+1/6+1/12+1/20+1/30+...+1/9702+1/9900