脱式计算，能简算的要简算．①0.25×+×25%②÷（1﹣×）③（84%÷3+8.72）×（1﹣）④12×（﹣）
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﹣=﹣=+=
+
×25%
÷（1﹣
×
）
）
﹣
+
+
．
= 1﹣40%=
= 52= 1÷
=
=
=
=
=
= 0.8×
÷
=
= 1﹣
=
=
=
= 1﹣
=
=
=
=
=
= 1﹣
=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
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