计算下面各题（能简便计算的要用简便方法计算）
456﹣199 0.25×5.7×4 252÷24﹣0.4×6
（3.8﹣1.8÷2）×
（8+
）÷4 4.4﹣
+1.6﹣
．
计算下面各题（能简便计算的要用简便方法计算）
456﹣199 0.25×5.7×4 252÷24﹣0.4×6
（3.8﹣1.8÷2）× （8+）÷4 4.4﹣+1.6﹣．
×
= 1÷
= 4×60%= 0.875÷0.125=
=
×3.6= 0×
=
=
= 1÷40%=
=
= 72×25%=
=
÷
=
×
÷
=
=
÷20%=（
+
）×20=
=
=
=
=
=
=
=
=
=
=
=
=
×12= 0.45×2= 34×0.2=
÷2=
= 9.9+2.43+0.1=
×
= 6.8×2.5=
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