一块合金里铜和锌的比是4：5，现加入8克的锌，重新熔化成一块新的合金共重53克，求原合金中铜和锌各重多少克？
直接写出得数．+= ﹣= += ﹣=10﹣﹣= = = ==．
直接写得数= = = == 1﹣= 1﹣= =
直接写出得数.+= 1﹣= ﹣= 2.5×3.8×4=+= 10﹣9.12= +0.25= 0.65×9+0.65=
计算下面各题，能简算的要简算． ．
直接写得数﹣= ﹣= += 1﹣=+= ﹣=
+
= 
﹣
= 
+
= 
﹣
=
﹣
= 
= 
= 
=
=．
= 
= 
= 
=
= 1﹣
= 1﹣
= 
=
+
= 1﹣
= 
﹣
= 2.5×3.8×4=
+
= 10﹣9.12= 
+0.25= 0.65×9+0.65=
．
﹣
= 
﹣
+
= 1﹣
=
+
= 
﹣
=
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