(1/55+2/55+3/55+~+10/55)-(11/155+12/155+~20/55)用简便算法,

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(1/55+2/55+3/55+~+10/55)-(11/155+12/155+~20/55)
用简便算法,

(1/55+2/55+3/55+~~~~~+10/55)-(11/155+12/155+~~~20/155)
=(1+10)*5/55-(11+20)*5/155
=1-1
=0