用竖式计算（最后两道要验算）．145×27 918÷51 406×30 200÷25 340×27 2100÷35．
直接写得数．==== 49÷7= 74﹣47= 985×0= 300×4= 300+1070= 48÷5= 4×3+2= 5×8﹣7= 510×7≈ 48×5≈ 397×3≈ 121×4≈
直接写出得数.+=﹣=+=﹣=﹣=+= 1﹣=﹣=+=+=
直接写出得数．= 6﹣==== 5﹣===
计算下面各题，怎样计算简便就怎样计算．++．
口算．+=+=+=++=﹣=﹣=﹣=
=
=
=
=
+
=
﹣
=
+
=
﹣
=
=
= 1﹣
=
﹣
=
+
=
+
=
= 6﹣
=
=
=
= 5﹣
=
=
=
+
+
．
+
=
+
=
+
=
+
+
﹣
=
﹣
=
﹣
=
粤公网安备 44130202000953号