某书店将定价6.25元的画册降价20%后卖出，结果还获得成本25%的利润。此画册的成本价是多少元？
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=
直接写出得数﹣=﹣=+=+= 1﹣﹣=+=﹣=+=
= 
= 
= 
= ．
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
．
+
= 43×200= 1﹣
= 350+50=
+
= 45﹣9×5=
﹣
=
﹣
=
+
=
+
﹣
=
=
﹣
=
+
=
粤公网安备 44130202000953号