PP-T2-DS172

[Huang Hsin-Yi]

172. 17043-!-item-!-187;#058&011315
If a and b are nonzero numbers on the number line, is 0 between a and b ?

(1) The distance between 0 and a is greater than the distance between 0 and b.

(2) The sum of the distances between 0 and a and between 0 and b is greater than the distance between 0 and the sum a + b .

Ans:B

實在是看不懂B選項說的意思

[nemolee]

(B)的意思是說，0到a 與 0到b 的距離總合 > 0 到 (a+b) 距離的合

藍色的部份是把距離格數求來就好了，後面黃色的是直接把數值代入
這樣就可以了

[Huang Hsin-Yi]

這樣子,我懂了,謝謝

[Huang Hsin-Yi]

今天再算一次
(2)選項,還是無法得知 is 0 between a and b?

[bluff]

(2)|a|+|b|>|a+b|
只有當a,b異號時才符合條件
可以推得 0 between a and b

[Huang Hsin-Yi]

我真的懂了,感謝!!