(1):1000/4000=25%
(2): 1000/(5000-1000)=25%
(3)5000/(5000-1000)=125%
(4) 30 30×(1 1/6)=65
(5) :假设女生四个那么男生五个,所以1:(5—4)÷5=20% ; 2:5÷(5 4)=55.6%
lz望采纳啊
(1):1000/4000=25%
(2): 1000/(5000-1000)=25%
(3)5000/(5000-1000)=125%
(4) 30 30×(1 1/6)=65
(5) :假设女生四个那么男生五个,所以1:(5—4)÷5=20% ; 2:5÷(5 4)=55.6%
lz望采纳啊