设牛X,羊Y,
X=Y(1+25%)=5/4*Y
所以Y=4/5*X=X(1-20%)
少了20%
设羊是100,则牛是:100*(1+25%)=125
那么羊比牛少:(125-100)/125*100%=20%
25%/(1+25%)
=25%/125%
=20%
“牛的头数比羊的只数多25%”,羊的只数是单位“1”,那么牛的只数就是(1+25%=1.25)
“羊的只数比牛的头数少百分之几”,牛的只数是单位“1”,所以
(1.25-1)/1.25=20%
某畜牧场牛的头数比羊多百分之25,羊比牛少百分之几?
某畜牧场牛的头数比羊多百分之25,羊比牛少百分之几?
数学人气:932 ℃时间:2019-11-06 22:14:17
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