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在prep1里整理了几道同类型的题，感觉完全没有思路，都是误打误撞做的结果。T190是第一次模考时碰到的最后一道题，当时至少绕了四五分钟也没想明白，然后被嗖一的一声飞进来的考试结束的对话框吓了一大跳，所以印象比较深刻，呵呵。请问大家都是怎么求解的，给点思路，谢谢了~~~ 127.
On the number line, if the number k is to the left of the number t, is the product kt to the right of t ?
(1) t < 0
(2) k < 1
正确答案A 128.
The points A, B, C, and D are on a number line, not necessarily in that order. If the distance between A and B is 18 and the distance between C and D is 8, what is the distance between B and D ?
(1) The distance between C and A is the same as the distance between C and B.
(2) A is to the left of D on the number line. 正确答案E 190.
On the number line shown, is zero halfway between r and s ?
(1) s is to the right of zero.
(2) The distance between t and r is the same as the distance between t and -s. 图粘不上，请大家动手划一划：数轴，从左至右依次是r,s,t. 正确答案C On the number line shown, is zero halfway between r and s ?
(1) s is to the right of zero.
(2) The distance between t and r is the same as the distance between t and -s. 图粘不上，请大家动手划一划：数轴，从左至右依次是r,s,t. 正确答案C On the number line shown, is zero halfway between r and s ?
(1) s is to the right of zero.
(2) The distance between t and r is the same as the distance between t and -s. 图粘不上，请大家动手划一划：数轴，从左至右依次是r,s,t. 正确答案C On the number line shown, is zero halfway between r and s ?
(1) s is to the right of zero.
(2) The distance between t and r is the same as the distance between t and -s. 图粘不上，请大家动手划一划：数轴，从左至右依次是r,s,t. 正确答案C  | 
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发表于 2009-7-11 22:37:00
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