x的平方-9分之2x+3-x分之1+x+3分之x+2
问题描述：
x的平方-9分之2x+3-x分之1+x+3分之x+2
答
=2x/(x+3)(x-3) -1/(x-3)+(x+2)/(x+3)
=[2x-(x+3)+(x+2)(x-3)]/(x+3)(x-3)
=(2x-x-3+x²-x-6)/(x+3)(x-3)
=(x²-9)/(x²-9)
=1