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

Toán Lớp 7: 200 + 198 + 196 + 194 + … +2 – 199 – 197 – 195 – 193 – … -1

Toán Lớp 7: 200 + 198 + 196 + 194 + … +2 – 199 – 197 – 195 – 193 – … -1

Comments ( 2 )

  1. 200 + 198 + 196 + 194 + … + 2 – 199 – 197 – 195 – 193 – … – 1
    = (200 – 199) + (198 – 197) + (196 – 195) + (194 – 193) + … + (2 – 1)
    = 1 + 1 + 1 + 1 + … + 1 (Có: 200 : 2 = 100 số)
    = 1 . 100
    = 100

  2. Giải đáp+Lời giải và giải thích chi tiết: 
    200 + 198 + 196 + 194 + … +2 – 199 – 197 – 195 – 193 – … -1
    = (200 + 198 + … + 4 + 2) – (199 + 197 + … + 3 + 1)
    = (2 + 4 + … + 198 + 200) – (1 + 3 + … + 197 + 199)
    = ((200 + 2) .100)/2 – ((199 + 1) . 100)/2
    = 10100 + 10000
    = 20100

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

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