用简便方法计算下面各题：1997+1998+1999+2001 3425﹣188﹣212﹣25567×999+567×2 （ 91×48×75 ）÷（ 25×13×16）
直接写出得数．+= +=﹣= 15﹣=
= = = == = = =
口算高速直达.+= += 0.32= +2= +﹣+=﹣0.25= += 12.5×8= 2﹣﹣= ﹣+=
直接写出得数．+= 1﹣= 0.32= 1﹣+=+= 5﹣= ﹣= 0.75+=
直接写出得数．3.6+2= ﹣0.4= +0.3= +0.25= ﹣0.375= ﹣0.3=
+
= 
+
=
﹣
= 15﹣
=
= 
= 
= 
=
= 
= 
= 
=
+
= 
+
= 0.32= 
+2= 
+
﹣
=
﹣0.25= 
+
= 12.5×8= 2﹣
﹣
= 
﹣
+
=
+
= 1﹣
= 0.32= 1﹣
+
=
+
= 5﹣
= 
﹣
= 0.75+
=
= 
﹣0.4= 
+0.3= 
+0.25= 
﹣0.375= 
﹣0.3=
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