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

Toán Lớp 6: giúp e với ạ: -5 (2-x) + 4 (x-3) = 10x -15

Toán Lớp 6: giúp e với ạ:
-5 (2-x) + 4 (x-3) = 10x -15

Comments ( 2 )

  1. Bạn tham khảo ~~
    …….
    -5.(2-x) + 4.(x-3) = 10x -15
    ⇔ – 10 + 5x + 4x – 12 – 10x + 15 =0
    ⇔ -7 – x =0
    ⇔ -x = 7
    ⇔ x= -7

  2. -5 ( 2 – x ) + 4 ( x -3 ) = 10x – 15
    ⇒ -10 – (-5)x + 4x – 12 = 10x – 15
    ⇒ -10 + 5x + 4x – 12 = 10x – 15
    ⇒ -10 – 12 + 15 = 10x – 5x – 4x
    ⇒ -7 = x
    Vậy x = -7
    Áp dụng :
    – Quy tắc chuyển vế

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