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

Toán Lớp 8: (3 – 3x)/(2x) + (3x – 1)/(2x – 1) + (11x – 5)/(2x – 4x ^ 2)

Toán Lớp 8: (3 – 3x)/(2x) + (3x – 1)/(2x – 1) + (11x – 5)/(2x – 4x ^ 2)

Comments ( 2 )

  1. Giải đáp:
    $\frac{3 -3x}{2x}$ +$\frac{3x – 1}{2x – 1}$ +$\frac{11x – 5}{2x – 4x ^ 2}$=2-3x
    Lời giải và giải thích chi tiết:
    $\frac{3 -3x}{2x}$ +$\frac{3x – 1}{2x – 1}$ +$\frac{11x – 5}{2x – 4x ^ 2}$ 
    =$\frac{3 -3}{2}$ +$\frac{3 – 1}{2 – 1}$ +$\frac{11 – 5}{2x – 4x }$ 
    =$\frac{0}{2}$ +$\frac{2}{1}$ +$\frac{6}{-2x }$ 
    =0+2+-3x
    =2-3x

  2. (3 – 3x)/(2x) + (3x – 1)/(2x – 1) + (11x – 5)/(2x – 4x ^ 2)
    =((3 – 3x)(2x-1))/(2x(2x-1)) + (2x(3x – 1))/(2x(2x – 1)) + (5-11x)/( 2x(2x -1) )
    =(6x-3-6x^2+3x)/(2x(2x-1)) + (6x ^2- 2x)/(2x(2x – 1)) + (5-11x)/( 2x(2x -1) )
    =[6x-3-6x^2+3x+6x ^2- 2x+5-11x]/[2x(2x – 1)]
    =[-4x+2]/[2x(2x – 1)]
    =[2(1-2x)]/[2x(2x – 1)]
    =-[(1-2x)]/[x(1-2x)]
    =-1/x
     

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