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题目内容
During the 2nd month to the 4th month, each month`s sales are 50 more than the former month. And during the 5th month to the 7th month, each month`s sales are 100 fewer than the former month. Then what is the range of sales between the 1st month and the 7th month?
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以上解析由 考满分老师提供。