Point a and b are on the number line, the distance between a and b is 7, if a = 7, what is the possible value of b?

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问题 Point a and b are on the number line, the distance between a and b is 7, if a = 7, what is the possible value of b?

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答案0或14

解析 a与b之间的距离为|a-b|=|7-b|=7,因此7-b=7或7-b=7,b=0或14。
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