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标题: [求助]GWD31套 1-16 [打印本页]

作者: XIAOSHAONIAN    时间: 2007-10-4 14:02     标题: [求助]GWD31套 1-16

If J,S,and V are points on the number line, what is the distance between S and V?

(1) the distance between J and S is 20

(2) the distance between J and V is 25

答案选E 可是我觉得是C,联立的话不是能求出来S-V是5么?

谢谢回答


作者: dreadpower    时间: 2007-10-4 18:54

V的两个不同位置决定有可能是5 或45 两种情况

V-----J---S    J-------S--V


作者: XIAOSHAONIAN    时间: 2007-10-6 06:33

大感谢>"<

我真粗心~






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