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

Toán Lớp 8: Tìm x 3x.(x-5)-3x²=10 B)2x.(x-1)-3.(x-1)=0

Toán Lớp 8: Tìm x
3x.(x-5)-3x²=10
B)2x.(x-1)-3.(x-1)=0

Comments ( 2 )

  1. Giải đáp:Lời giải và giải thích chi tiết:
      a 3x.(x-5)-3x²=10
    ⇒3x²-15x-3x²=10
    ⇒-15x=10
    ⇒x=-10/15
    ⇒x=-2/3
    Vật x=-2/3
    b 2x.(x-1)-3.(x-1)=0
    ⇒(x-1)(2x-3)=0
    Th1:x-1=0
    ⇒x=1
    Th2: 2x-3=0
    ⇒2x=3
    ⇒x=3/2
    Vậy x=1;3/2

  2. a) 3x(x-5)-3x^2=10
    ⇔3x^2-15x-3x^2=10
    ⇔-15x=10
    ⇔x=-2/3
    Vậy x=-2/3
    b) 2x(x-1)-3(x-1)=0
    ⇔(x-1)(2x-3)=0
    ⇔\(\left[ \begin{array}{l}x-1=0\\2x-3=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=1\\x=\dfrac{3}{2}\end{array} \right.\) 
    Vậy x=1 hoặc x=3/2
     

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

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