直接写出得数642+448= 820﹣260= 25×88= 2400÷600=2﹣0.77= 0.04×5= 20.5+3.3= 10÷0.01=+= 1﹣= ×= ÷=
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=
+
= 1﹣
= 
×
= 
÷
=+= 1﹣= ×= ÷=
= 1﹣
=
=
=
= 1﹣
=
=
=
=
=
= 1﹣
=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
．
+
= 43×200= 1﹣
= 350+50=
+
= 45﹣9×5=
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