1/1*4+1/4*7+1/7*10+···+1/91*94等于几?(不要答案,各种求.)
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1/1*4+1/4*7+1/7*10+···+1/91*94等于几?(不要答案,各种求.)
1/1*4+1/4*7+1/7*10+···+1/91*94等于几?(不要答案,各种求.)
1/1*4+1/4*7+1/7*10+···+1/91*94等于几?(不要答案,各种求.)
1/1*4+1/4*7+1/7*10+···+1/91*94
=1/3(1-1/4)+1/3(1/4-1/7)+1/3(1/7-1/10)+...+1/3(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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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
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