千分之七点五怎么用数学表示
(1)千分之七点五=7.5/1000=(7.5÷10)/(1000÷10)=0.75/100=0.75%
(2)千分之七点五=7.5/1000=0.0075
(3)千分之七点五=75/10000
=(75÷25)/(10000÷25)
=3/400
(1)千分之七点五=7.5/1000=(7.5÷10)/(1000÷10)=0.75/100=0.75%
(2)千分之七点五=7.5/1000=0.0075
(3)千分之七点五=75/10000
=(75÷25)/(10000÷25)
=3/400