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题目：
某商店1998—2004年的销售额资料如下：年份1998199920002001200220032004销售额（万元）230236245250257263270要求：根据以上资料用最小平方法配合直线趋势方程，并据此预测该商店2005年的销售额。
答案：
<查看本题扣3积分>
y=250.14+6.64t，据此预测2.....
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