直接填得数：﹣= 25÷26= += 1﹣+= += 0.23= 2﹣= 1﹣0.32= ．
直接写得数．×4．
下面的计算对吗？把不对的改正过来．
km的一半是多少千米？
======
= 12×===×24=×=×=×=
﹣
= 25÷26= 
+
= 1﹣
+
= 
+
= 0.23= 2﹣
= 1﹣0.32= ．
×4．
km的一半是多少千米？
=
=
=
=
=
=
= 12×
=
=
=
×24=
×
=
×
=
×
=
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