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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tính `1/2 + 1/6 + 1/12 + … + 1/380`

Toán Lớp 7: Tính
1/2 + 1/6 + 1/12 + … + 1/380

Comments ( 2 )

  1. 1/2 + 1/6 +1/12+….+1/380
    =1/(1.2)+1/(2.3)+1/(3.4)+…+1/(19.20)
    =1/1-1/2+1/2-1/3+1/3-1/4+…..+1/19-1/20
    =1-1/20
    =19/20
     

  2. 1/2+1/6+1/12+…+1/380
    =1/(1.2)+1/(2.3)+1/(3.4)+…+1/(19.20)
    =1/1-1/2+1/2-1/3+1/3-1/4+…+1/19-1/20
    =1-1/20
    =20/20-1/20
    =19/20

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222-9+11+12:2*14+14 = ? ( )