计算下面各题，能简算的要简算．12×（+﹣） ÷× 4×0.8×0.25×12.5 2.94×+4.06÷ ÷﹙×÷﹚ （12﹣12×）÷．
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．．
直接写得数．+= 43×200= 1﹣= 350+50= 630÷7= 15×6÷9=+= 45﹣9×5=
+
﹣
） 
÷
×
4×0.8×0.25×12.5 
+4.06÷
÷﹙
×
÷
﹚ （12﹣12×
）÷
．
= 1﹣
=
=
=
= 1﹣
=
=
=
=
=
= 1﹣
=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
．
+
= 43×200= 1﹣
= 350+50=
+
= 45﹣9×5=
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