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

Toán Lớp 8: help me nhanh nha quy đồng mẫu các phân thức sau 5/2x-2;3/x^2-1;-(x+3)/2x+2

Toán Lớp 8: help me nhanh nha
quy đồng mẫu các phân thức sau
5/2x-2;3/x^2-1;-(x+3)/2x+2

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    Mẫu thức chung : 2(x – 1)(x + 1)
    5/(2x – 2) = 5/(2(x – 1)) = (5(x + 1))/(2(x – 1)(x + 1))
    3/(x^2 – 1) = 3/((x – 1)(x + 1)) = 6/(2(x – 1)(x + 1))
    (-(x + 3))/(2x + 2) = (-(x + 3))/(2(x + 1)) = (-(x + 3)(x – 1))/(2(x – 1)(x + 1)

  2. $\\\text{MTC :} 2(x-1)(x+1)\\\text{Quy đồng :}\\\begin{cases} \dfrac{5}{2x-2}=\dfrac{5}{2(x-1)}=\dfrac{5(x+1)}{2(x-1)(x+1)}=\dfrac{5x+5}{2(x-1)(x+1)}\\\dfrac{3}{x^2-1}=\dfrac{3}{(x-1)(x+1)}=\dfrac{6}{2(x-1)(x+1)}\\\dfrac{-(x+3)}{2x+2}=\dfrac{-(x+3)}{2(x+1)}=\dfrac{-(x+3)(x-1)}{2(x+1)(x-1)}=\dfrac{-x^2-2x+3}{2(x-1)(x+1)}\end{cases}$
     

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

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