1/1*4+1/4*7+1/7*10+···+1/91*94等于几?
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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+···+1/91*94等于几?
计算5/1*4-11/4*7+17/7*10-···+41/19*22
计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)································································································
1/1×4+1/4+7+1/7×10+······+1/28×31的简便方法是1/1×4+1/4×7+1/7×10+······+1/28×31的简便方法
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
1/1*4+1/4*7+1/7*10+···+1/91*94等于几?(不要答案,各种求.)
(1×4)分之一 +(4×7)分之一 + (7×10)分之一 ····+(97×100)分之一
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
1/4+1/4*1/7+1/7*1/10+...1/25*1/28=?
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