口算：4500÷5÷9= 9×506﹣404= 999÷9= 102×4÷8= 203×4=720÷9÷4= 0÷209= 150×4= 510÷5= 840÷4=
直接写出得数 21×=÷2=﹣= 12÷=÷0.8= 12÷= 4﹣2= 14×÷14×=
计算：+=﹣= 12×=÷= 0×+9=÷3=×14= 20÷= 1.25××8= 14×÷14×=
+= 6÷=×0.25=÷=×= 9﹣=÷42= 1÷=
口算====÷=×36=÷3= 6÷=
直接写出计算结果．+=×0×27= 6÷=×39= 24÷=×4﹣2= 45÷= 1﹣﹣=+÷+=×÷×=
=
÷2=
﹣
= 12÷
=
÷0.8= 12÷
= 4﹣2
÷14×
=
+
=
﹣
= 12×
=
÷
=
+9=
÷3=
×14= 20÷
=
×8= 14×
÷14×
+
= 6÷
=
×0.25=
÷
=
×
= 9﹣
=
÷42= 1÷
=
=
=
=
=
÷
=
×36=
÷3= 6÷
=
+
=
×0×27= 6÷
=
×39= 24÷
=
×4﹣2= 45÷
= 1﹣
﹣
=
+
÷
=
×
÷
×
=
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