化简求值;(x^2-6x+9/x^2-9)+(x^3-4x^+4x/x^2+3x)

问题描述:

化简求值;(x^2-6x+9/x^2-9)+(x^3-4x^+4x/x^2+3x)

原式=(x-3)²/(x+3)(x-3)+(x²-4x+4)/(x+3)
=(x-3)/(x+3)+(x²-4x+4)/(x+3)
=(x-3+x²-4x+4)/(x+3)
=(x²-3x+1)/(x+3)