【解】
问：在数轴上,x和y之间的距离要大于x和z之间的距离.问z是否在x和y之间?
答：若y与z同在x左侧或同在x右侧,则z在x、y之间；否则不在.
下面的两个条件没什么用,只能从(1)推出x、y、z三数为一负二正,从(2)推出x、y异号而已.
On the number line,the distance between x and y is greater t
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