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

Toán Lớp 6: 3.x+36=-7.x-64 Nêu rõ cách làm

Toán Lớp 6: 3.x+36=-7.x-64
Nêu rõ cách làm

Comments ( 2 )

  1. 3x+36=-7x-64
    ⇔ 3x+36+7x=-64
    ⇔ 10x+36=-64
    ⇔ 10x=-64-36
    ⇔ 10x=-100
    ⇔ x=-100 : 10
    ⇔ x=-10
    Vậy x=-10
     

  2. 3 . x + 36 = (-7) . x – 64
    3x + 36 – 36 = -7x – 64 – 36
    3x = -7x – 100
    3x + 7x = -7x – 100 + 7x
    (3 + 7) x = -100
    10x = -100
    x = (-100) : 10
    x = -10
    Vậy x = -10
     

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

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