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

Toán Lớp 8: rút gọn A= 1/x-2 + x^2-x-2/x^2-7x+10 – 2x-4/x-5

Toán Lớp 8: rút gọn A= 1/x-2 + x^2-x-2/x^2-7x+10 – 2x-4/x-5

Comments ( 2 )

  1. Giải đáp:
    A= 1/(x-2) + (x^2-x-2)/(x^2-7x+10) -( 2x-4)/(x-5)(x ne 2,x ne 5)
    A=(x-5)/((x-2)(x-5))+(x^2-x-2)/((x-2)(x-5))-(2(x-2)(x-2))/((x-2)(x-5))
    A=(x-5+x^2-x-2-2(x-2)^2)/((x-2)(x-5))
    A=(x^2-7-2(x^2-4x+4))/((x-2)(x-5))
    A=(-x^2+8x-15)/((x-2)(x-5))
    A=(-(x^2-8x+15))/((x-2)(x-5))
    A=(-(x^2-3x-5x+15))/((x-2)(x-5))
    A=(-[x(x-3)-5(x-3)])/((x-2)(x-5))
    A=(-(x-3)(x-5))/((x-2)(x-5))
    A=(-(x-3))/(x-2)

  2. A=1/(x-2) +(x^2-x-2)/(x^2-7x+10) -(2x-4)/(x-5) 
    A=(x-5)/((x-2)(x-5))+(x²-x-2)/((x-2)(x-5))-((2x-4)(x-2))/((x-5)(x-2))
    A=(x-5+x²-x-2-2x²+4x+4x-8)/((x-2)(x-5))
    A=(-x²+8x-15)/((x-2)(x-5))
    A=-(x²-8x+15)/((x-2)(x-5))
    A=-((x-3)(x-5))/((x-2)(x-5))
    A=(-x+3)/(x-2)
    #NoCopy

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

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