在一个笼子里，有鸡又有兔共8只，数一下它们的脚，共有20只．请问笼子里鸡、兔各有几只？
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﹣﹣=++=
+
=
=
﹣
=
﹣
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=
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﹣
= 1﹣
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=
﹣
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﹣
﹣
+
+
+0.25+0.625．
﹣3
﹣0.625．
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=
﹣
=
﹣
=
+
=
﹣
= 1
﹣
= 2﹣
﹣
=
+
+
=
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