x的平方-2+x分之1-x除以(x-2+x+2分之3),其中x等于2分之1=(1-x)/(x²-2+x)÷[x-2+3/(x+2)]=(1-x)/(x+2)(x-1)÷(x²-4+3)/(x+2)=-1/(x+2)×(x+2)/(x-1)(x-3)=-1/(x-1)(x-3)=-1/(1/2-1)(1/2-3)=-4/5;很高兴为您...