口算．= = 5﹣= =0×1= 1÷= = =
计算． 21÷ 18÷ 15÷ 反思 计算上面的题目以后，你发现了什么？能结合具体的例子说说为什么吗？试着计算下面的题目．不计算，你能比较算式的大小吗？ 15÷ ×15 9÷ 9×．
8÷÷12÷．
口算题．= 3=÷6= 6=====
======
计算．
= 
= 5﹣
= 
=
= 1÷
= 
= 
=
÷12
÷
．
= 3
=
÷6=
=
=
=
=
=
=
=
=
=
=
=
．
粤公网安备 44130202000953号