商店规定，用5个空瓶就要换1瓶汽水．某班同学一共喝了100瓶汽水，其中有一些是用喝剩下的空瓶换的．请问：他们开始至少掏钱买了多少瓶汽水？
直接写得数．+=+=﹣= 1﹣=﹣= 0.25+=+= 2+=+=﹣=
脱式计算，能简算的要简算． 3﹣﹣++﹣+﹣．
①+=②+=③﹣= ④2﹣=⑤+=⑥+=
下面各题怎样算简便就怎样算． 6﹣﹣．
直接写得数．﹣=﹣=+=+=+=﹣=﹣= 0.3+=
+
+
=
﹣
= 1﹣
=
﹣
=
=
+
= 2+
=
+
=
﹣
=
﹣
+
+
﹣
+
﹣
．
+
+
=③
﹣
=
=⑤
+
=⑥
+
=
﹣
．
﹣
=
﹣
=
+
=
+
=
+
=
﹣
=
﹣
= 0.3+
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