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

Toán Lớp 8: Tìm x biết: 5x- 3{ 4x-2 [ 4x – 3( 5x-2)]} = 182

Toán Lớp 8: Tìm x biết: 5x- 3{ 4x-2 [ 4x – 3( 5x-2)]} = 182

Comments ( 2 )

  1. Lời giải:
    5x-3{4x-2[4x-3(5x-2)]}=182
    ⇔5x-3[4x-2(4x-15x+6)]=182
    ⇔5x-3[4x-2(-11x+6)]=182
    ⇔5x-3(4x+22x-12)=182
    ⇔5x-3(26x-12)=182
    ⇔5x-78x+36=182
    ⇔-73x=182-36
    ⇔-73x=146
    ⇔x=-2
    Vậy x=-2

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    5x- 3{ 4x-2 [ 4x – 3( 5x-2)]} = 182
    (=) 5x – 3 . [4x – 2(4x – 15x + 6)]
    (=) 5x – 3 . (4x – 8x + 30x – 12)
    (=) 5x – 12x + 24x – 90x + 36
    (=) -73x + 36 = 182
    (=) -73x = 182 – 36
    (=) -73x = 146
    (=) x = 146 : -73
    =) x = -2
    Xin hay nhất
     

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

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