(x-3分之2x-x+3分之x)乘x分之x方-9

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(x-3分之2x-x+3分之x)乘x分之x方-9
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(x-3分之2x-x+3分之x)乘x分之x方-9
(x-3分之2x-x+3分之x)乘x分之x方-9

(x-3分之2x-x+3分之x)乘x分之x方-9
(x-3分之2x-x+3分之x)乘x分之x方-9
=(2x*(x+3)-x(x-3))/((x-3)(x+3))*(x-3)(x+3)/x
=(2x²+6x-x²+3x)/x
=(x²+9x)/x
=x+9

(x-2/3x-x+x/3)×x²/x-9
=(x-x-2/3x+1/3x)×x-9
=(0-2/3x+1/3x)×x-9
=(-1/3x)×x-9
=-3x²-9
(望采纳,谢谢)