5.37÷1.3，商取一位小数时，商是 ，余数是 ．
3.6× =3600；0.9÷ =0.009．
1.2× =0.48 2时45分= 时．
当a=1时，a 1；当a×=1时，a 1．
= ÷9．
+=× = ．
=1时，a 1；当a×
=1时，a 1．
= ÷9．
+
=
粤公网安备 44130202000953号