口算下面各题．
56+37= 80﹣16= 5+5= 12﹣1.1=
2×0.2= 2.87÷0.7= 
+
= 
﹣
=
= 30÷50= 25×8= 
+
=
= 12×
= 1÷
= 0×
=
口算下面各题．
56+37= 80﹣16= 5+5= 12﹣1.1=
2×0.2= 2.87÷0.7= += ﹣== 30÷50= 25×8= +== 12×= 1÷= 0×=
km的一半是多少千米？
=
=
=
=
=
=
= 12×
=
=
=
×24=
×
=
×
=
×
=
米的
是多少米？
吨的
是多少吨？
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