估算8.4×8.8 76×0.98 721÷8.9 4.2÷5.9 13.8÷7.2 23.49×4.03．
算一算．+=﹣=+=+=﹣=﹣=
+= 1﹣=+=+= 1﹣=+=﹣=﹣=
直接写出得数．﹣=+=﹣=+=﹣=﹣=
计算下面各题．+﹣﹣+ 1﹣++﹣﹣（+） 1﹣（﹣）
计算．====
+
=
﹣
=
+
=
+
=
﹣
=
﹣
=
+
= 1﹣
=
+
=
+
=
=
+
=
﹣
=
﹣
=
﹣
=
+
=
﹣
=
+
=
﹣
=
﹣
=
+
﹣
﹣
+
1﹣
+
+
﹣
﹣（
+
） 1﹣（
﹣
）
=
=
=
=
粤公网安备 44130202000953号