= ÷60=2：5= %= 成．
÷7=÷ =38．
× =× = ×= ×0.1=+ = ﹣．
× =× =+ =1.5× =× =1．
× =3600 × =3600 × =3600 × =3600 × =3600．
× = ÷=+ =1．
= ÷60=2：5= %= 成．
÷ =38．
× =
× = ×
= ×0.1=
+ = ﹣
× =
× =
+ =1.5× =
× =1．
× = ÷
+ =1．
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