6.974保留整数是 ,精确到十分位是 ,保留两位小数是 .
12÷ =0.75= :32= :20= %= 折.
= :24== %
÷ ═==0.75= : .
= ÷12=18: =2.25=1= %.
=4: = ÷54= (填小数)