在百货公司,3/5的商品打5折,1/5的商品打3折（折让7折）.1/10的商品打2折,其余的是不打折的.假设一个商品被随机选中,那么这个商品打5折或者是3折的概率有多大?
5折：3/5
3折：1/5
5折或者是3折的概率 3/5+1/5=4/ 5
Sat数学题求解释和过程At a department store,3/5of the items are discou
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