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

Toán Lớp 6: c) (25 – 2x) : 5 – 9 = 16 -50 bang may mu may

Toán Lớp 6: c) (25 – 2x) : 5 – 9 = 16
-50 bang may mu may

Comments ( 2 )

  1. (25 – 2x) : 5 – 9 = 16
    (25 – 2x) : 5 = 16 + 9
    (25 – 2x) : 5 = 25
    25 – 2x = 25 . 5 = 125
    2x = 25 – 125
    2x = -100
    x = -100 : 2 = -50
    -50 không tác ra được số mũ nhé, nếu như có sẽ là số vô tỉ.

  2.     ( 25 – 2x ) : 5 – 9 = 16
    ⇔ ( 25 – 2x ) : 5 = 16 + 9
    ⇔ ( 25 – 2x ) : 5 = 25
    ⇔ 25 – 2x = 25 . 5
    ⇔ 25 – 2x = 125
    ⇔ 2x = 25 – 125
    ⇔ 2x = -100
    ⇔ x = -50
     Vậy x = -50
     

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

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