两个因数的积保留两位小数的近似值是2.58,准确值可能是 .①2.509 ②2.578 ③2.574.
6÷ ==0.75= :40= %
1÷ =0.125= :16== %
÷0.8= :16==0.75= %
0.35== :20= %
= %= :4=.