一條math

(x-a)(x-b)(x-c)....(x-y)(x-z)
= (x-a)(x-b)(x-c)....(x-x)(x-y)(x-z)
= (x-a)(x-b)(x-c)....(0)(x-y)(x-z)
= 0.

(x-a)(x-b)(x-c)......(x-y)(x-z)

We can show the other numbers:
(x-a)(x-b)(x-c)(x-d)(x-e)(x-f)(x-g)(x-h)(x-i)(x-j)......(x-w)(x-x)(x-y)(x-z)
In the 24th number:
(x-x)
x is x, they are the same number.

So:
x-x
=0

The answer is:
(x-a)(x-b)(x-c)(x-d)(x-e)(x-f)(x-g)(x-h)(x-i)(x-j)......(x-w)(x-x)(x-y)(x-z)
=(x-a)(x-b)(x-c)(x-d)(x-e)(x-f)(x-g)(x-h)(x-i)(x-j)......(x-w)(0)(x-y)(x-z)
=0

Any number X0 must be 0.

(x-a)(x-b)(x-c)....(x-y)(x-z)
(x-a)(x-b)(x-c)....(x-x)(x-y)(x-z)
(x-a)(x-b)(x-c)....(0)(x-y)(x-z)
因為任何數乘0都係等於0
所以答案會等於0

不如你計是最好不過的！！
你可以問ｔｅａｃｈｅｒ！
ｔｅａｃｈｅｒ的答應是最好不過的牙！！

(x-a)(x-b)(x-c)....(x-y)(x-z) = (x-a)(x-b)(x-c)....(x-y)(x-z)