(3²+1)/(3²-1)+(5²+1)/(5²-1)+(7²+1)/(7²-1)+(9²+1)/(9²-1)
(3²+1)/(3²-1)+(5²+1)/(5²-1)+(7²+1)/(7²-1)+(9²+1)/(...
(3²+1)/(3²-1)+(5²+1)/(5²-1)+(7²+1)/(7²-1)+(9²+1)/(9²-1)
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原式=1-2/(3²-1)+1-2/(5²-1)+1-2/(7²-1)+1-2/(9²-1)
=4-2[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)]
=4-2*2*[(1/2-1/4)+(1/4-1/6)+(1/6-1/8)+(1/8-1/10)]
=4-4(1/2-1/10)
=4(1-1/2+1/10)
=4*3/5
=27/5
=4-2[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)]
=4-2*2*[(1/2-1/4)+(1/4-1/6)+(1/6-1/8)+(1/8-1/10)]
=4-4(1/2-1/10)
=4(1-1/2+1/10)
=4*3/5
=27/5
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(3²+1)/(3²-1)+(5²+1)/(5²-1)+(7²+1)/(7²-1)+(9²+1)/(9²-1)
=10/8+26/24+50/48+82/80
=5/4+13/12+25/24+41/40
=(1+1/4)+(1+1/12)+(1+1/24)+(1+1/40)
=5+(1/4+1/12+1/24+1/40)
=5+(1/4)(1+1/3+1/6+1/10)
=5+(1/4)×(8/5)=5+2/5=27/5.
=10/8+26/24+50/48+82/80
=5/4+13/12+25/24+41/40
=(1+1/4)+(1+1/12)+(1+1/24)+(1+1/40)
=5+(1/4+1/12+1/24+1/40)
=5+(1/4)(1+1/3+1/6+1/10)
=5+(1/4)×(8/5)=5+2/5=27/5.
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答案是 4.4
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