一、口算：(每题1分，共40分)
－2.7=
14×
=
÷5=
1
=
－
=
=
24
= 
0.25×8=
3.4-
-
=
+0.5=
10.5-1.05= 
10.01÷10%=
1.5×
= 
80%= 1×9
= 3×
=