(x-3分之2x-x+3分之x)乘x分之x方-9

问题描述:

(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