8/9-7/8+6/7-5/6+4/5-3/4+2/3-1/2=？
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=（1-1/9)-(1-7/8)+(1-1/7)-(1-1/6)+(1-1/段棚5)-(1-1/4)+(1-1/3)-(1-1/2)
=(1/8-1/9)+(1/6-1/7)+(1/4-1/5)+(1/2-1/3)
=1/72+1/42+1/握简则20+1/6
=1/72+1/20+8/42=1/72+1/20+4/21
=1/72+(21+80)/420=1/72+101/420
=35/咐闷2520+606/2520=641/2520
=(1/8-1/9)+(1/6-1/7)+(1/4-1/5)+(1/2-1/3)
=1/72+1/42+1/握简则20+1/6
=1/72+1/20+8/42=1/72+1/20+4/21
=1/72+(21+80)/420=1/72+101/420
=35/咐闷2520+606/2520=641/2520
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