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

Toán Lớp 8: 7x-3 2 ==- = ==– giải giúp e cái X-1 3

Toán Lớp 8: 7x-3 2
——- = ——– giải giúp e cái
X-1 3

Comments ( 2 )

  1. (7x-3)/(x – 1) = 2/3
    ⇔ 3(7x – 3) = 2(x – 1)
    ⇔ 21x – 9 = 2x – 2
    ⇔ 21x – 2x = -2 + 9
    ⇔ 19x = 7
    ⇔ x = 7/19

  2. {7x-3}/{x-1} = 2/3
    -> 2(x-1) = 3(7x-3)
    -> 2x – 2 = 21x – 9
    -> 2x – 21x = -9 +2
    -> -19x = -7
    -> x = 7/19
    Vậy x = 7/19

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

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