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英文数学应用题Saida owned 125 shares of an oil company.One day,the

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英文数学应用题
Saida owned 125 shares of an oil company.One day,the value of each share dropped by $0.31.The next day,the value of each share rose by $0.18.What was the total change in the value of Saida's Shares.麻烦把SOLUTION写出来.THANK YOU
Saida拥有一个石油公司的股份125股.一天,每股降了$0.31.第二天,每股升了$0.18.
Saida的股份总价值变化了多少?
$0.31 - $0.18 = $0.13 The value of each share dropped by $0.13 after the 2 days' changes in price
$0.13 X 125 shares = $16.25 The total value of Saida's shares dropped by $16.25.
再问: 为什么是0.31-0.18 他那里是DROP0.31 那么不是-0.31-0.18
再答: 一个道理啊,我后面说明了是drop的值啊 The value of each share dropped by $0.13 after the 2 days' changes in price 降得多,降的减升的,就是降的 升得多,升的减降的,就是升的