1×2分之一 2×3分之一 3×4分之一…2017×2018分之一等于
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2017-07-19
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1/(1×2)-1/(2×3)-1/(3×4)-……-1/(2017×2018)
=(1/1-1/2)-(1/2-1/3)-(1/3-1/4)-......-(1/2017-1/2018)
=1/1-1/2-1/2+1/3-1/3+1/4-1/4+1/5-...-1/2016+1/2017-1/2017+1/2018
=1/2018
=(1/1-1/2)-(1/2-1/3)-(1/3-1/4)-......-(1/2017-1/2018)
=1/1-1/2-1/2+1/3-1/3+1/4-1/4+1/5-...-1/2016+1/2017-1/2017+1/2018
=1/2018
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展开全部
1/(1×2)-1/(2×3)-1/(3×4)-……-1/(2017×2018)
=(1/1-1/2)-(1/2-1/3)-(1/3-1/4)-......-(1/2017-1/2018)
=1/1-1/2-1/2+1/3-1/3+1/4-1/4+1/5-...-1/2016+1/2017-1/2017+1/2018
=1/20
=(1/1-1/2)-(1/2-1/3)-(1/3-1/4)-......-(1/2017-1/2018)
=1/1-1/2-1/2+1/3-1/3+1/4-1/4+1/5-...-1/2016+1/2017-1/2017+1/2018
=1/20
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