1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)...1/(199*201)=?
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1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)...1/(199*201)=?
1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)...1/(199*201)=?
1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)...1/(199*201)=?
1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)...1/(199*201)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9...+1/199-1/201)=100/201
原式=(1-1/3+1/3-1/5+1/5-1/7+……+1/199-1/201)x 1/2
=(1-1/201)x 1/2
=200/201 x 1/2
=100/201
=1/2×(1-1/3+1/3-1/5+……+1/199-1/201)=1/2×(1-1/201)=100/201
化简1/3:1/5
1+1+5+25+3
1/3+1/5是什么意思?
1+1+2+3*5
(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简算(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简便计算
1+1+1+1+1-5+5-5+1+1-2+3+3+3+3-6-3-3等于多少?
5(X-3)+1
1+3+5+.+99
1 3 5题,
1、2、3、5,
1,3,5题
1-3+5-7+...
1,3、5题
1+3+5+...+2011
1,3,5题,
3 1 5是什么意思?
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
3/1:4/1:5/1化简是?