作业帮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+···+1/91*94等于几?
1/1*4+1/4*7+1/7*10+···+1/91*94等于几?
1/1*4+1/4*7+1/7*10+···+1/91*94等于几?
31/94 解:1/1*4=1/3*(1-1/4) 1/4*7=1/3(1/4-1/7) 原式=1/3*[1-1/4+1/4-1/7+1/7.+1/87-1/91+1/91-1/94=1/3*(1-1/94)=31/94
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?
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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
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