一根5米长的钢筋锯成一样长的6段,每段占全长的 ,每段长 米.
12÷ =0.75= :32= :20= %= 折.
= :24== %
÷ ═==0.75= : .
= ÷12=18: =2.25=1= %.
=4: = ÷54= (填小数)