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

Toán Lớp 5: Bài 2: (0,5 điểm) Tìm y, biết : y : 0,5 + y : 0,25 = 9

Toán Lớp 5: Bài 2: (0,5 điểm) Tìm y, biết : y : 0,5 + y : 0,25 = 9

Comments ( 2 )

  1. y : 0,5 + y : 0,25 = 9
    y : 1/2 + y : 1/4 = 9
    y × 2 + y × 4 = 9
    y × (2 + 4) = 9
    y × 6 = 9
    y = 9 : 6
    y = 3/2
    Vậy y = 3/2

  2. y:0,5+y:0,25=9
    <=>y:1/2+y:1/4=9
    <=>y×2+y×4=9
    <=>y.(2+4)=9
    <=>y.6=9
    <=>y=9:6
    <=>y=3/2
    ________________________________
    thõa mãn: 3/2:0,5+3/2:0,25=9 

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