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

Toán Lớp 6: x.0,125=3,6+2,8\8 tìm x họ mình nhé

Toán Lớp 6: x.0,125=3,6+2,8\8 tìm x họ mình nhé

Comments ( 2 )

  1. x. 0,125 = 3,6 + (2,8)/8
    ⇔ x. 0,125 = 3,6 + 28/80
    ⇔ x. 0,125 = 3,6 + 7/20
    ⇔ x. 0,125 = 18/5 + 7/20
    ⇔ x. 0,125 = 79/20
    x = 79/20 : 0,125
    x = 79 : (20. 0,125)
    x = 79/(2,5)
    x = 790/25
    x = 158/5 
     

  2. x.0,125=3,6+(2,8)/8
    ↔x. 1/8=18/5+$\dfrac{\dfrac{14}{5}}{8}$
    ↔x. 1/8=18/5+14/5. 1/8
    ↔x. 1/8=18/5+7/20
    ↔x. 1/8=72/20+7/20
    ↔x. 1/8=79/20
    ↔x=79/20:1/8
    ↔x=79/20. 8
    ↔x=158/5
    Vậy x=158/5

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

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