1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55
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1/5*7+1/7*9+1/9*11+1/11*13+...1/53*551/5*7+1/7*9+1/9*11+1/11*13+...1/53*551/5*7+1/7*9+1/9*11+1/11*13
1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55
1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55
1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55
裂项求和
1/1*3+1/3*5+1/5*7+1/7*9+1/9*11+1/11*13+1/13*15+1/53*55
=1/2*(1-1/3+1/3-1/5+...+1/13-1/15..-1/55)
=1/2*(1-1/55)
=1/2*54/55
=27/55
计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13
简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
(1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1
1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
(1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1
1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55
1/5*7+1/7*9+1/9*11+1/11*13+.+1/23*25
1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
计算：2/3*5+1/5*7+1/7*9+1/9*11+1/11*13
|(1/5)-(1/7)|+|(1/9)-(1/7)|+|(1/9)-(1/11)怎么计算
1/5*7+1/7*9+1/9*11+1/11*13
1+3+5+7+9+11+.+99
1-3+5-7+9-11+13
1-3+5-7+9-11+.求救
1+3+5+7+9+11=?
1,3,5,7,9,11,15
计算:1-3 5-7 9-11
(1/5+1/7+1/9+1/11)*(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)*(1/7+1/9+1/11)简便运算