3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
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3/1x5+3/5x9+3/9x13+...+3/1997x2001简算3/1x5+3/5x9+3/9x13+...+3/1997x2001简算3/1x5+3/5x9+3/9x13+...+3/199
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001
=3/4(4/1x5+4/5x9+4/9x13+...+4/1997x2001)
=3/4(1/1-1/5+1/5-1/9+1/9-1/13+...+1/1997-1/2001)
=3/4(1-1/2001)
=(3/4)(2000/2001)
=500/667
原式=3/4(1-1/5+1/5-1/9+…+1/1997-1/2001)=3/4(1-1/2001)=500/67
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
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2/3+2/3x5+2/5x7+2/7x9+2/9x11+2/11x13=?
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