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

Toán Lớp 8: $\frac{$(3x+2)^{2}$-$(x+2)^{2}$}{$x^{3}$-$x^{2}$}$

Toán Lớp 8: $\frac{$(3x+2)^{2}$-$(x+2)^{2}$}{$x^{3}$-$x^{2}$}$

Comments ( 1 )

  1. ĐKXĐ: x\ne0; x\ne1
    ((3x+2)^2-(x+2)^2)/(x^3-x^2)
    =((9x^2+12x+4)-(x^2+4x+4))/(x^2(x-1))
    =(9x^2+12x+4-x^2-4x-4)/(x^2(x-1))
    =(8x^2+8x)/(x^2(x-1))
    =(8x(x+1))/(x^2(x-1))
    =(8(x+1))/(x(x-1))
    Vậy với x\ne0; x\ne1 thì ((3x+2)^2-(x+2)^2)/(x^3-x^2)=(8(x+1))/(x(x-1))
    \text{#Familyisnumber1}

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

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