直接写得数2.4×5= 1÷×5= 242.4÷12= 23÷10%= +=﹣+= 12×（+）= ×3÷×3= 1÷0.2÷0.5= 502﹣399=5﹣+= 0.9+99×0.9=
看谁算得又对又快．======．
3与4的倒数之差是多少？
算一算．+=﹣=+=+=﹣=﹣=
+= 1﹣=+=+= 1﹣=+=﹣=﹣=
直接写出得数．﹣=+=﹣=+=﹣=﹣=
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