计算，能简便的要简便算．31.9×18﹣8×31.9 21÷（+）÷ ×14+ 7.8÷[32×（1﹣）+3.6]．
口算下面各题．÷8= ×= 5÷= 3+3÷7=×15= 10÷10%= 28×75%= ×8×=
直接写出得数．×16= += 0÷= ÷3=÷= 7﹣= ×= 8÷=
直接写出得数．6÷= ×= 0÷= 4.1﹣÷=﹣= ÷= ×8×= 化简比0.6：=
直接写出得数．×= ×4= ×= ×= 3×=÷2= = ×= 12= ﹣1÷2=
直接写出得数．×= ÷= ÷26= = == ×÷= = = 1.2÷=
+
）÷
7.8÷[32×（1﹣
）+3.6]．
÷8= 
×
= 5÷
= 3+3÷7=
×15= 10÷10%= 28×75%= 
×8×
=
×16= 
+
= 0÷
= 
÷3=
÷
= 7﹣
= 
×
= 8÷
=
= 
×
= 0÷
= 4.1﹣
÷
= 
÷
= 
×8×
= 化简比0.6：
=
×
= 
×4= 
×
×
= 3×
=
÷2= 
= 
×
= 12
= 
﹣1÷2=
×
= 
÷
÷26= 
= 
=
= 
×
÷
= 
= 
= 1.2÷
=
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