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

Toán Lớp 5: 6,62 x x + 3,38 x x = 5 X x 0,5 + 1/4 x x = 4/5 x 3

Toán Lớp 5: 6,62 x x + 3,38 x x = 5 X x 0,5 + 1/4 x x = 4/5 x 3

Comments ( 2 )

  1. 1.
    6,62 × x + 3,38 × x = 5
    (6,62 + 3,38) × x = 5
    10 × x = 5
    x = 5 : 10
    x = 0,5
    Vậy x = 0,5
    2.
    x × 0,5 + 1/4 × x = 4/5 × 3
    x × 1/2 + 1/4 × x = 12/5
    x × (1/2 + 1/4) = 12/5
    x × 3/4 = 12/5
    x = 12/5 : 3/4
    x = 16/5
    Vậy x = 16/5

  2. 6,62 xx x + 3,38 xx x = 5
    ⇔ ( 6,62 + 3,38 ) xx x = 5
    ⇔ 10 xx x = 5
    ⇔ x = 0,5
    Vậy x = 0,5
    x xx 0,5 + 1/4 xx x = 4/5 xx 3
    ⇔ x × ( 1/2 + 1/4 ) = 12/5
    ⇔ x × 3/4 = 12/5
    ⇔ x = 16/5
    Vậy x = 16/5
     

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