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

Toán Lớp 8: Bài 4 : Tìm x biết rằng : 1) 3x + 2(5 – x) = -11 2) 3×2- 3x(-2 + x) = 36 giúp zới ạ

Toán Lớp 8: Bài 4 : Tìm x biết rằng :
1) 3x + 2(5 – x) = -11
2) 3×2- 3x(-2 + x) = 36
giúp zới ạ

Comments ( 2 )

  1. A, 3x+2(5-x)=-11
    <=>3x+10-2x=-11
    <=>x=-21
    B, 3×2-3x(-2+x)=36
    <=>3×2+6x-3×2=36
    <=>6x=36
    <=>x=6
     
     

  2. 1) 3x + 2(5 – x) = -11
    <=> 3x+10-2x=-11
    <=>3x-2x=-11-10
    <=>x=-21
    Vậy x={-21}
    2)3x^2-3x(-2+x)=36
    <=>3x^2+6x-3x^2=36
    <=>6x=36
    <=>x=6
    Vậy x={6}

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