1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011 =
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1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011=1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011=1/1×4+1/4×7+1/
1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011 =
1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011 =
1/1×4+1/4×7+1/7×10+1/10×13+···+1/2008×2011 =
1/(1×4)+1/(4×7)+1/(7×10)+1/(10×13)+···+1/(2008×2011)
=(1-1/4)/3+(1/4-1/7)/3+...+(1/2008-1/2011)/3
=(1-1/4+1/4-1/7+...+1/2008-1/2011)/3
=(1-1/2011)/3
=670/2011
1/4+1/4*1/7+1/7*1/10+...1/25*1/28=?
1/1*4+1/4*7+1/7*10+1/10*13+~+1/97*100
1/1*4+1/4*7+1/7*10+1/10*13+…+1/298*301
1/4*1+1/4*7+1/7*10+1/10*13+1/13*16=?
1/1*4+1/4*7+1/7*10+1/10*13+1/13*16
1/1*4+1/4*7+1/7*10+.+1/2005*2008 1/1*4+1/4*7+1/7*10+.+1/2005*2008
1/1*4+1/4*7+1/7*10+.+1/52*55*+1/55*58=?
1/1×4+1/4×7+1/7×10+.+1/52×55+1/55×58
1如何计算1*1/4+4*1/7+7*1/10+...+2002*1/2005
计算1/1*4+1/4*7+1/7*10+...+1/2005*2008+1/2008*2011
1/1×4+1/4×7+1/7×10+...+1/22×25+1/25×28
1/1*4+1/4*7+1/7*10+.1/2002*2005+1/2005*2008
1/4*+1/4*7+1/7*10+1/10*14+.+1/91*94=
1*1/4+4*1/7+7*1/10+...+97*1/100简便方法计算
1/1*4+1/4*7+1/7*10+.+1/91*94
1/1*4+1/4*7+1/7*10+...+1/97*100怎样算
1/(1*4)+1/(4*7)+1/(7*10)...+1/(91*94) 简算法算
1/1*4+1/4*7+1/7*10+...+1/91*94 要详细点快啊