鸡兔同笼，有12个头，40只脚，算一算，笼子里有几只鸡，几只兔？
直接写出得数+=﹣= 0÷6= 39×= 15﹣= 1÷= 21÷=（+）×6=×÷×= 8×﹣=
直接写出得数．========
口算．== 5﹣== 0×1= 1÷===
直接写得数．========
直接写得数+=÷7=×=÷=×8= 9÷= 15×=﹣=÷=×=×=÷=
+
=
﹣
= 0÷6
= 39×
= 15﹣
=
= 21÷
=（
+
）×6=
×
÷
×
﹣
=
=
=
=
=
=
=
=
=
=
= 5﹣
=
=
= 1÷
=
=
=
=
=
=
=
=
=
=
=
+
=
÷7=
×
=
÷
=
×8= 9÷
= 15×
=
﹣
=
÷
=
×
=
=
÷
=
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