过程,急用
1/(3*5)+1/(5*7)+...+1/(2011*2013)
=1/2[(1/3)-(1/5)+(1/5)-(1/7)+...+(1/2011)-(1/2013)]
=1/2(1/3-1/2013)
=1005/6039
题目没说清楚括号位置追问
=1/2[(1/3)-(1/5)+(1/5)-(1/7)+...+(1/2011)-(1/2013)]
=1/2(1/3-1/2013)
=1005/6039
题目没说清楚括号位置追问
错了吧?
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