上个回答是正确的,不过最后答案应该是20/21
1/2*1 1/2*3 1/3*4 .1/20*19 1/20*21怎么简算
1个回答
相关问题
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巧算:1/1×2+1/2×3+1/3×4+.+1/19×20+1/20×21
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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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简算1/(2×3)+1/(3×4)+1/(4×5)+……+1/(18×19)+1/(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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|1/3-1/4|+|1/4-1/5|+……+|1/20-1/19|怎么算?
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(2+3+4+……+20+21)-(1+2+3+……+19+20)用简便算式计算
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|1/2-1|+|1/3-1/2|+|1/4-1/3|+.……|1/20-1/19|
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计算(1+1/1×2)+(2+1/2×3)+(3+1/3×4)+……+(20+1/20×21)
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计算:(1+[1/1×2])+(2+[1/2×3])+(3+[1/3×4])+…+(20+[1/20×21]).
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算式(1+1/2+1/3...+1/20)+(1+2/3+2/4+2/5..+2/20)+.+(1+18/19+18/2