PP-T2-DS-53

[amyliang]

53. 4404-!-item-!-187;#058&003880
The symbol @ represents one of the four arithmetic operations: addition, subtraction, multiplication, and division. Is (5 @ 6) @ 2 = 5 @ (6 @ 2) ?
(1) 5 @ 6 = 6 @ 5
(2) 2 @ 0 = 2

ans: A

請問 第二個條件為什麼不行
第二個條件不就加跟減可以嗎???

[sunnyblue13s]

(2) 2 @ 0 = 2
if @ is subtraction,

(5-6)-2=-3
5-(6-2)= 1

[amyliang]

讓我死了吧....