x三次-27分之x平方+3x+9+9-x分之6-6+2x分之x-1是化简啊

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x三次-27分之x平方+3x+9+9-x分之6-6+2x分之x-1是化简啊

x三次-27分之x平方+3x+9+9-x分之6-6+2x分之x-1是化简啊
x三次-27分之x平方+3x+9+9-x分之6-6+2x分之x-1
是化简啊

x三次-27分之x平方+3x+9+9-x分之6-6+2x分之x-1是化简啊
是9-x²分之6
原式=(x²+3x+9)/(x-3)(x²+3x+9)-6/(x-3)(x+3)-(x-1)/2(x+3)
=1/(x-3)-6/(x-3)(x+3)-(x-1)/2(x+3)
=[2(x+3)-12-(x-1)(x-3)/[2(x+3)(x-3)]
=(2x+6-12-x²+4x-3)/[2(x+3)(x-3)]
=-(x²-6x+9)/[2(x+3)(x-3)]
=-(x-3)²/[2(x+3)(x-3)]
=(3-x)/(2x+6)