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

Toán Lớp 5: tìm x biết: x: 1/8 + x : 1/5 – x : 1/3=490

Toán Lớp 5: tìm x biết: x: 1/8 + x : 1/5 – x : 1/3=490

Comments ( 2 )

  1. 1/8 + x : 1/5 -x : 1/3 = 490
    ⇒ x : 1/5 – x : 1/3 = 490 – 1/8
    ⇔ x : (1/5 – 1/3) = 3919/3
    ⇔ x : ( -2/15 ) = 3919/8
    ⇔x = 3919/8 × ( -2/15 )
    ⇔ x= -3919/69
    Vậy x=-3919/60
    Chúc bạn học tốt :3

  2. x:1/8 + x : 1/5 – x : 1/3=490
    => 8x +5x – 3x = 490
    => 10x=490
    => x = 49

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