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

Toán Lớp 6: tính M=15/7.8 – 17/8.9 + 1/9.10 + 1/10.11

Toán Lớp 6: tính
M=15/7.8 – 17/8.9 + 1/9.10 + 1/10.11

Comments ( 2 )

  1. M=15/(7.8)-17/(8.9)+1/(9.10)+1/(10.11)
    =1/8+1/7-1/8-1/9 +1/9-1/10+1/10-1/11
    = 1/7-1/11
    = 4/77

  2. Giải đáp:
     M = 15/(7.8) – 17/(8.9) + 1/(9.10) + 1/(10.11)
         = 1/7 + 1/8 – 1/8 – 1/9 + 1/9 – 1/10 +  1/10 – 1/11
         = 1/7 – 1/11
         =  4/77
     

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