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

Toán Lớp 8: X+1/2x+6+2x+3/x’2+3x phân thức đại số cộng trừ nhân chia phân thức

Toán Lớp 8: X+1/2x+6+2x+3/x’2+3x phân thức đại số cộng trừ nhân chia phân thức

Comments ( 2 )

  1. (x+1)/(2x+6)+(2x+3)/(x^2+3x)(x ne0;xne-3)
    =(x+1)/(2(x+3))+(2x+3)/(x(x+3))
    =(x(x+1)+2(2x+3))/(2x(x+3))
    =(x^2+5x+6)/(2x(x+3))
    =((x+2)(x+3))/(2x(x+3))
    =(x+2)/(2x)
     

  2. $\text{$\dfrac{x+1}{2x+6}$+$\dfrac{2x+3}{x²+3x}$}$
    $\text{=$\dfrac{x+1}{2(x+3)}$+$\dfrac{2x+3}{x(x+3)}$}$
    $\text{=$\dfrac{x²+x}{2x(x+3)}$+$\dfrac{4x+6}{2x(x+3)}$}$
    $\text{=$\dfrac{x²+5x+6}{2x(x+3)}$}$
    $\text{=$\dfrac{(x+2)(x+3)}{2x(x+3)}$}$
    $\text{=$\dfrac{x+2}{2x}$}$

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

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