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【简答题】
将进货单价为40元的商品按50元出售时，能卖500个．已知该商品每涨价1元，其销售量就要减少10个，为了赚8000元利润，应涨价多少元？
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【简答题】容许信号机显示一个蓝色灯光表示准许列车在通过色灯信号机显示红色灯光的情况下,以不超过的速度通过,运行到次一架通过信号机,并随时准备 underline;"> 。
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