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

Toán Lớp 8: Tính d,$\frac{2x+3}{x-5}$ + $\frac{2x-1}{5-x}$ e, 4/x+2 + 2/x-2 + 5x-6/4-x^2

Toán Lớp 8: Tính
d,$\frac{2x+3}{x-5}$ + $\frac{2x-1}{5-x}$
e, 4/x+2 + 2/x-2 + 5x-6/4-x^2

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     Bạn tham khảo

    toan-lop-8-tinh-d-frac-2-3-5-frac-2-1-5-e-4-2-2-2-5-6-4-2

  2. Giải đáp:
     $d) \dfrac{2x+3}{x-5}+\dfrac{2x-1}{5-x}$
    $= \dfrac{2x+3}{x-5}-\dfrac{2x-1}{x-5}$
    $= \dfrac{2x+3-2x+1}{x-5}$
    $= \dfrac{4}{x-5}$
    $e) \dfrac{4}{x+2}+\dfrac{2}{x-2}+\dfrac{5x-6}{4-x²}$
    $= \dfrac{4}{x+2}+\dfrac{2}{x-2}-\dfrac{5x-6}{(x+2).(x-2)}$
    $= \dfrac{4.(x-2)}{(x+2).(x-2)}+\dfrac{2.(x+2)}{(x+2).(x-2)}-\dfrac{5x-6}{(x+2).(x-2)}$
    $=\dfrac{4x-8}{(x+2).(x-2)}+\dfrac{2x+4}{(x+2).(x-2)}-\dfrac{5x-6}{(x+2).(x-2)}$
    $= \dfrac{ 4x-8+2x+4-5x+6}{(x+2).(x-2)}$
    $= \dfrac{x+2}{(x+2).(x-2)}$
    $= \dfrac{1}{x-2}$
     

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

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