x+2分之x平方-2x - x-1分之x平方-4X+4 除以x平方-16分之x平方+4x=x(x-2)/(x+2)÷(x-2)^2/(x-1)÷[x(x+4)/(x+4)(x-4)]=[x(x-2)/(x+2)]*[(x-1)/(x-2)^2*[(x-4)/x]=(x-1)(x-4)/(x+2)(x-2)代入x=2+√2原式=(1+√2)(√2-2...