2分之1+8分之7+24分之23+48分之47+80分之79
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2分之1+8分之7+24分之23+48分之47+80分之79
2分之1+8分之7+24分之23+48分之47+80分之79
2分之1+8分之7+24分之23+48分之47+80分之79
2分之1+8分之7+24分之23+48分之47+80分之79
= (24+42+46+47)/48 + 79/80
= 159/48 + 79/80
= 53/16 + 79/80
= 265/80 + 79/80
= 344 /80
= 10分之 43
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原式
=1-1/2+1-1/8+1-1/24+1-1/48+1-1/80
=5-(1/2+1/8+1/24+1/48+1/80)
=5-(1/1x2+1/2x4+1/4x6+1/6x8+1/8x10)
=5-[1/2x(1-1/2)+1/2x(1/2-1/4)+1/2x(1/4-1/6)+1/2x(1/6-1/8)+1/2x(1/8-1/10)]
...
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原式
=1-1/2+1-1/8+1-1/24+1-1/48+1-1/80
=5-(1/2+1/8+1/24+1/48+1/80)
=5-(1/1x2+1/2x4+1/4x6+1/6x8+1/8x10)
=5-[1/2x(1-1/2)+1/2x(1/2-1/4)+1/2x(1/4-1/6)+1/2x(1/6-1/8)+1/2x(1/8-1/10)]
=5-1/2x(1-1/2+1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)
=5-1/2x(1-1/10)
=5-1/2x9/10
=5-9/20
=4又11/20 (4又20分之11)
收起
等于5-1/2-1/8-1/24-1/48-1/80
=5-1/2-0.5*(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)=5-1/2-0.5*0.4=4.3
裂项相消
满意请采纳 谢谢