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

Toán Lớp 8: rút gọn : 3/x -1 + 2/x+1 – x-3/x^2-1

Toán Lớp 8: rút gọn : 3/x -1 + 2/x+1 – x-3/x^2-1

Comments ( 2 )

  1. Giải đáp:
     Giải thích chi tiết:
       3/(x-1) + 2/(x+ 1) – (x-3)/(x^2 -1) (1)
              $\Leftrightarrow$ [3.(x+1)]/[(x+1)(x-1)] + [2.(x-1)]/[(x+ 1).(x-1)] – [(x-3).1]/[(x+1).(x-1)]
              $\Leftrightarrow$ [3.(x+1) +2.(x-1) – (x-3).1]/ [(x+1).(x-1)]
              $\Leftrightarrow$ (3x+3 + 2x-2 – x+3)/[(x+1).(x-1)]
              $\Leftrightarrow$ (4x+ 4)/[(x+1).(x-1)]
              $\Leftrightarrow$ [4(x+1)]/[(x+1).(x-1)]
              $\Leftrightarrow$ 4/(x-1)
    mong ctlhn ạ~~
    chúc bạn học tốt

  2. 3/(x-1)+2/(x+1)-(x-3)/(x^2-1)
    =(3(x+1)+2(x-1)-(x-3))/(x^2-1)
    =(3x+3+2x-2-x+3)/(x^2-1)
    =(4x+4)/(x^2-1)
    =(4(x+1))/((x-1)(x+1))
    =4/(x-1)
    Điều kiện: x\ne+-1

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

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