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小六數學1/3+1/6+1/10+1/15+1/21=
Nov 6th 2013, 14:36

1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55=?
Sol
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
=1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)+1/(10*11)
=(3－2)/(2*3)+(4－3)/(3*4)+(5－4)/(4*5)+(6－5)/(5*6)+(7－6)/(6*7)
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