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

Toán Lớp 7: Tính 1/100 – 1/ 100.99 – 1/ 99.98 – … – 1/ 2.1

Toán Lớp 7: Tính
1/100 – 1/ 100.99 – 1/ 99.98 – … – 1/ 2.1

Comments ( 1 )

  1. 1/100 – 1/100.99 – 1/99.98 – … 1/2.1
    = 1/100 – (1/1.2 + … + 1/98.99 + 1/99.100)
    = 1/100 – (1/1 – 1/100)
    = 1/100 – 99/100
    = -98/100
    = -49/50

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