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

Toán Lớp 7: A,(1+2/3-1/4)x(0,8-3/40^2×17/240

Toán Lớp 7: A,(1+2/3-1/4)x(0,8-3/40^2×17/240

Comments ( 2 )

  1. A = (1 + 2/3 – 1/4) xx (0,8 – 3/40)^2 xx 17/240
    = (12/12 + 8/12 – 3/12) xx (8/10 – 3/40)^2 xx 17/240
    = ((12+8-3)/12) xx (32/40 – 3/40)^2 xx 17/240
    = 17/12 xx (29/40)^2 xx 17/240
    = 17/12 xx (29^2)/(40^2) xx 17/240
    = 17/12 xx 841/1600 xx 17/240
    = 14297/19200 xx 17/240
    = 243049/4608000
    Vậy A= 243049/4608000
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    A = (1 + 2/3 – 1/4) × (0,8 – 3/40)^2 × 17/240
    A = (3/3 + 2/3 – 1/4) × (8/10 – 3/40)^2 × 17/240
    A = (5/3 – 1/4) × (32/40 – 3/40)^2 × 17/240
    A = (20/12 – 3/12) × (29/40)^2 × 17/240
    A = 17/12 × 841/1600 × 17/240
    A = 14297/19200 × 17/240
    A = 243049/4608000

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