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

Toán Lớp 6: tính nhanh_giải thích các bước B=(4-1/23-56/39-25/47)/(5/69+5/117+5/141) Mong các Mod giúp eam vs ạ!!!

Toán Lớp 6: tính nhanh_giải thích các bước
B=(4-1/23-56/39-25/47)/(5/69+5/117+5/141)
Mong các Mod giúp eam vs ạ!!!

Comments ( 2 )

  1. B=(11/23+256/39+125/47)/(5/69+5/117+5/141)
    =(22/23+22/39+22/47)/(5/69+5/117+5/141)
    =[22(1/23+1/39+1/47)]/[5/3(1/23+1/39+1/47)]
    =22/5/3
    =6/65

  2. Giải đáp:
     B = (4 – 1/23 – 56/39 – 25/47)/(5/69+ 5/117 + 5/141)
        =(1 – 1/23 + 2 – 56/39  + 1 – 25/47)/(5/69 + 5/117 + 5/141)
       = (22/23 + 22/39 + 22/47)/(5/69 + 5/117 + 5/141)
      = (22 . (1/23 + 1/39 + 1/47))/(5/3 . (1/23 + 1/39 + 1/47)
      = 22/(5/3)
    = 66/5
     

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

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