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

Toán Lớp 8: 1 1 __ – _______ = x x+1

Toán Lớp 8: 1 1
__ – _______ =
x x+1

Comments ( 2 )

  1. Giải đáp:
    $\frac{1}{x(x+1)}$ 
    Lời giải và giải thích chi tiết:
    $\frac{1}{x}-$ $\frac{1}{x+1}$
    $=\frac{x+1}{x(x+1)}-$ $\frac{x}{x(x+1)}$
    $=\frac{x+1-x}{x(x+1)}$
    $=\frac{1}{x(x+1)}$ 

  2. Gửi bạn:
    $ĐKXĐ:x\neq 0;-1$
    $\dfrac{1}{x}-\dfrac{1}{x+1}$ 
    $=\dfrac{x+1}{x(x+1)}-\dfrac{x}{x(x+1)}$ 
    $=\dfrac{x+1-x}{x(x+1)}$ 
    $=\dfrac{1}{x(x+1)}$ 
     

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