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写出计算过程1/2+1/6+1/12+1/20-1/60-1/105-1/168-/1/252=(分数)
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写出计算过程1/2+1/6+1/12+1/20-1/60-1/105-1/168-/1/252=(分数)
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答案和解析
1/2+1/6+1/12+1/20-1/60-1/105-1/168-1/252
=(60+20+10+6-2)/120 - (96+60+40)/10080
=94/120-196/10080
=47/60-49/2520
=(47*42-49)/2520
=1925/2520
=385/504
=(60+20+10+6-2)/120 - (96+60+40)/10080
=94/120-196/10080
=47/60-49/2520
=(47*42-49)/2520
=1925/2520
=385/504
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