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

Toán Lớp 8: rút gọn bthuc : x+1/x-3 – 1-x/x+3 – 2x(1-x)/9-x^2

Toán Lớp 8: rút gọn bthuc : x+1/x-3 – 1-x/x+3 – 2x(1-x)/9-x^2

Comments ( 2 )

  1. #Hugg
    (x+1)/(x-3)-(1-x)/(x+3)-(2x(1-x))/(9-x^2)
    =((x+1)(x+3))/((x-3)(x+3))-((x-3)(1-x))/((x-3)(x+3))+(2x-2x^2)/((x-3)(x+3)
    =((x+1)(x+3)-(x-3)(1-x)+2x-2x^2)/((x-3)(x+3))
    =(x^2+4x+3-(x-x^2-3+3x)+2x-2x^2)/((x-3)(x+3))
    =(x^2+4x+3-x+x^2+3-3x+2x-2x^2)/((x-3)(x+3))
    =((x^2+x^2-2x^2)+(4x-x-3x+2x)+(3+3))/((x-3)(x+3))
    =(2x+6)/((x-3)(x+3))
    =(2(x+3))/((x-3)(x+3))
    =2/(x-3)

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-rut-gon-bthuc-1-3-1-3-2-1-9-2

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

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