x乘以2-1/x+(x^2-2x)分之x乘以(x^2-4)怎样化简这题

Question

x乘以2-1/x+(x^2-2x)分之x乘以(x^2-4) 怎样化简这题

Answer 1

x乘以2-1/x+(x^2-2x)分之x乘以(x^2-4)
=x(2-1/x)+ x/(x^2-2x) *(x^2-4)
=2x-1+ (x+2)
=3x+1