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

Toán Lớp 7: (4x – 3) – (x + 5) = 3(10 – x)

Toán Lớp 7: (4x – 3) – (x + 5) = 3(10 – x)

Comments ( 2 )

  1. Giải đáp:
    (4x – 3) – (x + 5) = 3(10 – x)
    -> 4x-3 – x – 5 = 30 – 3x
    -> (4x-x) + (-3-5) = 30-3x
    -> 3x – 8 = 30-3x
    -> 3x+3x = 30+8
    -> 6x = 38
    -> x = 19/3
    Vậy x=19/3
     

  2. ĐỀ:    (4x – 3) – (x + 5) = 3(10 – x)
    ⇒  4x – 3 – x – 5 = 3.10 – 3x
    ⇒  ( 4x-x ) + ( -3-5 ) = 30 – 3x
    ⇒   3x     +   (-8)    = 30 – 3x
    ⇒   3x + 3x  =  30 + 8
    ⇒   6x      =    38
    ⇒    x  =  38 ÷ 6
    ⇒    x  =  19/3 = 6,(3)
     

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