脱式计算．627+4650÷75×18（960﹣3200÷16）×233200÷（1280﹣72×15）300﹣300÷15×6．
计算．=+===﹣=== 1=
口算．．
．
我会算．++ 1﹣﹣++﹣﹣++ 1﹣﹣．
1﹣=+=﹣=+=﹣=+=+=+=
=
+
=
=
=
﹣
=
= 1
=
．
．
+
+
1﹣
﹣
+
+
﹣
﹣
+
+
﹣
．
=
+
﹣
=
+
﹣
=
+
=
+
=
+
=
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