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

Toán Lớp 8: `a, {4x – 2(x – 3) – 3[x – 3(4 – 2x) + 8]}. (-3x)`

Toán Lớp 8: a, {4x – 2(x – 3) – 3[x – 3(4 – 2x) + 8]}. (-3x)

Comments ( 2 )

  1. {4x – 2(x – 3) – 3[x – 3(4 – 2x) + 8]} . (-3x)
    = {4x – 2x + 6 – 3[x – 12 + 6x + 8]} . (-3x)
    = {4x – 2x + 6 – 21x + 36 – 24} . (-3x)
    = (-19x + 18) . (-3x)
    = 57x^2 – 54x
    Gửi bạn nha 

  2. {4x2(x3)3[x3(42x)+8]}.(3x)
    ⇒{4x2x+63[x−12+6x+8]}.(3x)
    ⇒{4x2x+63x−36-18x-24}.(3x)
    ⇒(-19x-54).(-3x)
    ⇒-3x=0
    ⇒-19x-54=0
    ⇒x=0
    ⇒x=-54/19

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