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一又1/2+5/6-7/12+9/20-11/30
=(1+1/2)+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)
=1+1/2+1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6
=2-1/6
=1又5/6
=(1+1/2)+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)
=1+1/2+1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6
=2-1/6
=1又5/6
展开全部
一又1/2+5/6-7/12+9/20-11/30
=(1+1/2)+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)
=1+1/2+1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6
=2-1/6
=1又5/6
=(1+1/2)+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)
=1+1/2+1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6
=2-1/6
=1又5/6
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