由7个1、9个0.1和5个0.01组成的数是 ,将它精确到十分位是 .
=8: = %
36: =0.75== ÷40= 折.
0.375=== :64= %
( )+= ×=÷ = ﹣= :4=0.5.
÷ ==30: =1.2= %.