[問題]GWD29-Q29

[k06922001]

For which real numbers x is the expression2/(X+1)(X-2) not defined?

A. x = 0 only
B. x = 2 only
C. x = –1 only
D. x = –1 or 2
E. x = –1, 0, or 2
答案是D...我不太理解題目的意思....是說哪一個x沒有定義??所以要選使x+1,x-2等於0的??是這個意思嘛?? 請解惑~~~謝謝

[Penny Lee]

我也是覺得會使分母為0的應該都算是無意義

[ypschool]

x = –1 or 2，則expression 2/(X+1)(X-2)，分母會為零，無意義。

[ritata]

那請問2/(X+1)(X-2)

B. x = 2 only
C. x = –1 only

同樣也會使分母為0呀