(x-y)³分之x-y 化简分式x²-6x+9分之x²-9

(x-y)³分之x-y 化简分式x²-6x+9分之x²-9
(x-y)³分之x-y 化简分式
x²-6x+9分之x²-9

(x-y)³分之x-y 化简分式x²-6x+9分之x²-9
(x-y)/(x-y)^3=1/(x - y)^2
(x^2-9)/(x^2-6x+9)=(3 + x)/(-3 + x)

（1）(x-y)/(x-y)^3=1/(x-y)^2
（2）原式=(x-3)(x+3)/(x^2-2x+9)已经最简