Question

X+2分之X-1乘X的平方—2X+1分之X的平方—4除以X的平方分之1

Answer 1

〔(x-1)/(x+2)〕×〔(x^2-4)/(x^2-2x+1)〕÷(1/x^2)

=〔(x-1)/(x+2)〕×〔(x+2)(x-2)/(x-1)^2〕×x^2

＝〔(x^2)(x-1)(x+2)(x-2)〕/〔(x+2)(x-1)^2〕

=x^2(x-2)/(x-1)