1吨铁的和3吨棉花的样重. .(判断对错)
13.5÷ ==0.45=18: = %
÷24=0.375=15: = :16= %
3÷5== %=9: = 折.
4:5= (填小数)=0.8: .
12÷ == ; 12== 小数= %