2.52×0.36的积有 位小数,保留一位小数约是 ,精确到千分位约是 .
12÷ =0.75== :36= %
÷ =0.125=2÷ == %
: == ÷20= 折.
:20==0.8=24÷ =80%= 成= 折.
= ÷ ==.