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

Toán Lớp 8: Tìm x, biết a) (8x^2-4x):(-4x)-(x+2)=8 b) (2x^4-3x^3+x^2):(-x^2)+4(x-1)^2=0

Toán Lớp 8: Tìm x, biết
a) (8x^2-4x):(-4x)-(x+2)=8
b) (2x^4-3x^3+x^2):(-x^2)+4(x-1)^2=0

Comments ( 2 )

  1. #tnvt
    a)(8x^2-4x):(-4x)-(x+2)=8
    <=>-2x+1-x-2=8
    <=>-3x=9
    <=>x=-3
    Vậy x=-3
    b)(2x^4-3x^3+x^2):(-x^2)+4(x-1)^2=0
    <=>-2x^2+3x-1+4(x^2-2x+1)=0
    <=>-2x^2+3x-1+4x^2-8x+4=0
    <=>2x^2-5x+3=0
    <=>2x^2-2x-3x+3=0
    <=>2x(x-1)-3(x-1)=0
    <=>(x-1)(2x-3)=0
    <=>$\left[\begin{matrix} x=1 \\ x=\dfrac{3}{2}\end{matrix}\right.$
    Vậy x\in{1;3/2}

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tim-biet-a-8-2-4-4-2-8-b-2-4-3-3-2-2-4-1-2-0

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