[問題] 數學JJ
官方JJ第142題
Given that a/b = 1.25, where a and b are integers. Which among the following
cannot be true:
I.a+b is an odd integer
II.ab is an odd integer
III.a+b is an even integer
答案：II
經過計算，(a,b)可以是(5,4)或(10,8)以此類推....
那I.和III.來說，只要(a,b)有一種組合成立就算滿足條件??
不應該是所有組合都要滿足條件嗎??
還是說題目是要問which among the following is(are) wrong?
才必須所有組合都要滿足條件
官方JJ第144題
144 【比大小】Given that m - 6z > 0 and 5z - m > 0.
Col A: m
Col B: 0
答案：B
這題也有點問題，麻煩解答，謝謝!!
官方JJ第145題
145 【计算题】If N = (-2) ^x, where x is a negative integer and -5 < x < -1.
What is the difference between maximum and minimum possible values of N?
答案：3/8
我算很多次，答案都是3/16
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◆ From: 221.120.3.31
※ 編輯: MUTELEAF 來自: 221.120.3.31 (07/14 11:27)
※ 編輯: MUTELEAF 來自: 221.120.64.70 (07/14 11:37)
推
07/14 11:43, , 1F
07/14 11:43, 1F
→
07/14 11:44, , 2F
07/14 11:44, 2F
→
07/14 11:45, , 3F
07/14 11:45, 3F
→
07/14 11:47, , 4F
07/14 11:47, 4F
推
07/14 12:30, , 5F
07/14 12:30, 5F
推
07/14 12:59, , 6F
07/14 12:59, 6F
推
07/14 14:39, , 7F
07/14 14:39, 7F
→
07/14 14:39, , 8F
07/14 14:39, 8F
→
07/14 15:15, , 9F
07/14 15:15, 9F
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