390×0.02=
﹣
= 5﹣1.4﹣1.6= 0.9﹣0.26=
81÷
= 4×（0.6+1.9）= 0.23×400=
×
=
﹣
+
= 0.9+99×0.9=
口算．
1.4×3=
=
= 1.8+0.32=
= 36.1÷5.9≈ 298×31≈ 499+203≈
直接写出下面各题的结果．
28×2= 1.8+2.9= 4.8÷12= 10﹣0.9=
0.25×4=
﹣
=
+
=
×
=
1﹣75%=
÷
=
直接写得数
3.3+6.07= 5×5%= 8÷1.6= 567﹣99=
3÷27= 3﹣
﹣
= 5×
÷5×=（
+
）×12=
口算下面各题：
10﹣0.4= 1÷9= 8.4÷2.1= 0.1×20%= 1.7×0.4=
+
=
×6=
÷
=
÷
=
×
=