如果用一根彩带能围成一个长为5分米，宽为3分米的长方形．想一想，用这根彩带围成一个正方形，它的边长是多少分米？
看谁算的又对又快．+=+=﹣=﹣= 1﹣=+=﹣= 1﹣=+=﹣=+=+=
看谁算得快． 1﹣﹣﹣+ 0.75+++0.25+0.625．
6﹣3﹣0.625．
计算．
直接写得数．+=﹣=﹣=+=﹣= 1﹣= 2﹣﹣=++=
+
=
=
﹣
=
﹣
=
=
+
﹣
= 1﹣
=
+
=
﹣
=
+
=
+
=
﹣
﹣
+
+
+0.25+0.625．
﹣3
﹣0.625．
+
=
﹣
=
﹣
=
+
=
﹣
= 1
﹣
= 2﹣
﹣
=
+
+
=
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