简化为1/3-1/4+1/4-1/5+1/5-1/6...+1/19-1/20=1/3-1/20=17/60
1/3*4+1/4*5+1/5*6+1/6*7...1/19*20
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相关问题
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1+1/2-2--+5/6+3+1/12-4+19/20-5+1/30+6+41/42-7-1/5
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1/1*3+1/2*4+1/3*5+1/4*6+1/5*7+1/6*8------1/17*19+1/18*20 怎样做
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1/1*3+1/2*4+1/3*5+1/4*6+1/5*7+1/6*8------1/17*19+1/18*20 如何用
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计算:|[1/4]-[1/3]|+|[1/5]-[1/4]|+|[1/6]-[1/5]|+…+|[1/20]-[1/19
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1/2*3*4+1/3*4*5+1/4*5*6……+1/19*20*21+1/20*21*22=
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1*1/2-2*5/6+3*1/12-4*19/20+5*1/30-6*41/42+7*1/56-
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1/1*2*3*4+1/2*3*4*5+1/3*4*5*6+-----+1/17*18*19*20
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1/3+1/(2*4)+1/(3*5)+1/(4+6).+1/(19*21)+1/(20*22)
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:(1/2+2/3+3/4+4/5+5/6+6/7)+(1/2+2/3+3/4+4/5+5/6+6/7)*1/2—(1+