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

Toán Lớp 5: tính: 2/9×11 + 2/11x 13 +-+2/173×175

Toán Lớp 5: tính: 2/9×11 + 2/11x 13 +….+2/173×175

Comments ( 2 )

  1. 2/9×11 + 2/11×13 + …. +2/173×175
    = 11-9/9×11 + 13-11/11×13 + …. + 175-173/173×175
    =11/9×11 – 9/9×11 + 13/11×13 – 11/11×13 + …. + 175/173×175 – 173/173×175
    = 1/9 – 1/11 + 1/11 – 1/13 + ….. + 1/173 – 1/175
    = 1/9 – 1/175
    =166/1575
    cho hay nhất nhé

  2. ~ Bạn tham khảo ~
    2/[9xx11]+2/[11xx13] + … + 2/[173xx175]
    = 1/9 – 1/11 + 1/11 – 1/13 + … + 1/173 – 1/175
    = 1/9 – 1/175
    = 166/1575

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