把三角ABC向右平移5格，新的三角形3个顶点分别用A′，B′和C′表示．再以A′为圆心，以A′C′为半径，画一个圆．
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﹣=﹣=+=
计算下列各题，能简算的要简算．．
= 1﹣40%=
= 52= 1÷
=
=
=
=
=
= 0.8×
÷
=
= 1﹣
=
=
=
= 1﹣
=
=
=
=
=
= 1﹣
=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
．
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