一个奶牛场今年养奶牛头数比去年减少12.5%,去年养奶牛640头,今年养了多少头?
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人气：221 ℃ 时间：2020-01-28 17:46:32
解答
比去年减少12.5%,今年是去年的1-12.5%=87.5%,所以今年是640*87.5%=560
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