直接写出得数．
20+30= 12×3= 3.5﹣0.2= 33÷1.1 99×6=
0.65+2.35= 0.1×0.03= 651﹣105= 2﹣
=
+
=
1÷
=
×26=÷
=
﹣
= 12÷
×0=
2+
=
×
=
+
+
=
×
×5=（0.27+0.9）÷0.9=
直接写出得数．
376﹣156= 1.8+3.2= 15×60= 2.8÷10= 10﹣2.7=
1﹣
=
÷3=
×
= 3.5×0.2= 0.1×0.2=
直接写得数．
84+414= 8.4﹣3.9= 0÷0.001=
1.25×8= 6×
=
÷0.5=
3﹣
﹣
=（﹣
）×12=
口算．
500×2= 400×5= 7×30= 28÷7=
40÷5= 53+7= 28÷4= 49+6=
100﹣49= 3600÷3= 47﹣28= 32÷8=
230×7= 55×4= 789×0= 500×8=
1﹣
= 
+
= 
﹣
= 
+
=
直接写结果．
246+298= 4.8÷1.2=
25×l.8×4= 8﹣0.75=
42÷
=
=
（﹣
）×12= 18
÷9=