1/24+1/35+1/48+1/63+1/80简算
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1/24+1/35+1/48+1/63+1/80
=1/2*(1/4-1/6)+1/2*(1/5-1/7)+1/2*(1/6-1/8)+1/2*(1/7-1/9)+1/2*(1/8-1/10)
=1/2*(1/4-1/10)+1/2(1/5-1/7)
=1/8+1/10-1/14
=9/40-1/14
=63/280-20/280
=43/280
=1/2*(1/4-1/6)+1/2*(1/5-1/7)+1/2*(1/6-1/8)+1/2*(1/7-1/9)+1/2*(1/8-1/10)
=1/2*(1/4-1/10)+1/2(1/5-1/7)
=1/8+1/10-1/14
=9/40-1/14
=63/280-20/280
=43/280
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