作业帮急:提问一道GRE数学
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急:提问一道GRE数学
1.Mr.Jones sold two house for 80000 dollars
each.One house was sold at a 20 percent loss and the other at a 20 percent
gain.What is the gain minus the loss?
因为盈的房子原价比亏得房子原价低,所以盈与亏的差数为负数.前半句能看懂,后半句不理解,虽然盈的房子原价比亏得房子原价低,但毕竟未算出具体原价,所以不确定原价与80000的各自差值谁大谁小吧?
1.Mr.Jones sold two house for 80000 dollars
each.One house was sold at a 20 percent loss and the other at a 20 percent
gain.What is the gain minus the loss?
因为盈的房子原价比亏得房子原价低,所以盈与亏的差数为负数.前半句能看懂,后半句不理解,虽然盈的房子原价比亏得房子原价低,但毕竟未算出具体原价,所以不确定原价与80000的各自差值谁大谁小吧?
题目应该是这样的,Jones先生有两套房子,每套卖了80000美元.
一套亏了20%,另一套赚了20%,
问题是,盈利减去亏损的差值是多少.
盈利的,（1+0.2）x=80000
亏损的,（1-0.2）y=80000
一套亏了20%,另一套赚了20%,
问题是,盈利减去亏损的差值是多少.
盈利的,（1+0.2）x=80000
亏损的,（1-0.2）y=80000