直接写答案．
20×10%=
÷
= 3.14×2.52=
5×0.4= 4×
÷4×=
﹣=
直接写出得数
1.2×0.5= 0÷10=
+
= 1﹣
=
1÷
=
×
=（1﹣）×16=
=
直接写得数．
2.6×0.25×4= 62= 0.56×
=
÷50%= 11.75﹣1.05=
÷
=
直接写出得数
3.14×22=
÷2= 3.14×40= 5×20×3.14=
9.42÷3.14= 2×
= 9÷
= 0.9﹣0.26=
÷6= 0.25×12= 1.2÷0.01=
+0.25=
口算：
12×0.6= 4.5÷
=
﹣
= 28×20%= 1.6×
=
1÷
= 36×
= 15÷
= 32= 0.12=
18.84÷3.14= 6.28÷3.14=
﹣
= 35×
= 1﹣4%=
7÷1.4= 1÷5%= 70%﹣60%= 80×125%= 2+53%=