一个9位数，最高位上是6，十万位上是最小的质数，千位上是最大的数，其余位上数都为0，则这个9位数写作 ，把它四舍五入到“万位”是 ．
÷7=÷ =38．
× =× = ×= ×0.1=+ = ﹣．
× =× =+ =1.5× =× =1．
× =3600 × =3600 × =3600 × =3600 × =3600．
× = ÷=+ =1．
÷ =38．
× =
× = ×
= ×0.1=
+ = ﹣
× =
× =
+ =1.5× =
× =1．
× = ÷
+ =1．
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