怎样简便怎样计算．×× （+）× ××39×55×（26×） ×+× ×[﹣（+）]34﹣34× [4﹣（﹣）]× +×（2.5﹣）
计算下面各题．+ 1﹣+．
直接写出得数.= 1﹣40%== 52= 1÷== 3﹣==== 0.8×÷=
看谁算得快．= 1﹣==== 1﹣=== 1﹣=== 1﹣=
怎样算简便就怎样算． ①= ②= ③= ④= ．
直接写出得数．+=﹣=﹣= 1﹣=﹣=+=
×
×
（
+
）×
×
×39×55
×（26×
） 
×
+
×
×[
﹣（
+
）]
[4﹣（
﹣
）]×
+
×（2.5﹣
）
+
+
．
= 1﹣40%=
= 52= 1÷
=
=
=
=
=
= 0.8×
÷
=
= 1﹣
=
=
=
= 1﹣
=
=
=
=
=
= 1﹣
=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
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