脱式计算．①（48+22）×23 ②123﹣23×5 ③（62﹣38 ）×19 ④252+228÷6．
直接写出计算结果．×= ÷2= 12×= 3÷= ﹣×=÷= ×14= 1﹣×= 6×÷= ÷=
口算．×3= 0÷= 0.5+= ×=8+= ÷= 2﹣﹣= 16.5+4.7=÷3÷= 5.6×=
直接写出得数：×= 15÷1%= 0.52= 3.14×6=0.25×8= ÷= 0.375×= ×3÷×3=
21÷ ÷ 24÷．
直接写出得数．14×= 9÷= ﹣= +=×75%= 1÷×= （62.5%﹣）÷2= 1﹣（+）=
×
= 
÷2= 12×
= 3÷
= 
﹣
×
=
÷
= 
×14= 1﹣
×
= 6×
= 
÷
=
×3= 0÷
= 0.5+
= 
×
=
= 
÷
= 2﹣
﹣
= 16.5+4.7=
÷3÷
=
×
= 15÷1%= 0.52= 3.14×6=
÷
= 0.375×
= 
×3÷
21÷
÷
24÷
．
= 9÷
= 
﹣
= 
+
=
×75%= 1÷
×
）÷2= 1﹣（
+
）=
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