在一幅地图上，用5厘米的线段表示实际距离200千米，这幅地图的比例尺是多少？在这幅地图上，量得南通到上海之间的距离大约是3厘米，求南通到上海实际距离大约是多少千米？
直接写出得数．2﹣= 0÷÷=+3= 134﹣34=×= ÷×=﹣= 4×=
﹣= 24×= 6+= ÷5= 5﹣=÷= ×0.5= 0.4÷= ×= +=
直接写出得数﹣= 2÷= 0.23×100= 51×=13×（2+）= +÷5= 6÷（﹣）= ：=．
直接写出得数0.25= 1.6+4= == 8÷0.2= == = =25×4×0×125=
直接写出得数．+= ﹣= ×2= ×= 54﹣54×0=×= ÷4= ÷= ÷42= 0÷25+2.5=×= ×14= ÷4= +÷+=
= 0÷
÷
=
+3= 134﹣34=
×
= 
÷
×
﹣
= 4×
=
﹣
= 24×
= 6+
= 
÷5= 5﹣
=
÷
= 
×0.5= 0.4÷
×
= 
+
=
﹣
= 2÷
= 0.23×100= 51×
=
）= 
+
÷5= 6÷（
）= ：
=
= 1.6+4= 
=
= 8÷0.2= 
=
= 
= 
=
+
= 
﹣
= 
×2= 
×
= 54﹣54×0=
×
= 
÷4= 
= 
÷42= 0÷25+2.5=
×
= 
×14= 
÷4= 
+
+
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