一张长方形纸长25厘米，宽20厘米．在这张长方形纸四个角上分别剪掉一个边长5厘米的正方形（如图），然后折成一个无盖的纸盒。这个无盖纸盒的容积是多少？
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%=
直接写得数．
÷0.1= 10﹣2×
= 3.54+198= 25%×15=
×5÷×5=
0.5÷0.01= 0.26×
= 100÷0.01= 102×71≈ 3÷
﹣÷3=
直接写出得数．
1﹣0.74= 1.25×3×8= 0.25×1.2= 6.18÷0.6=
÷
= 0÷7.5+2.5=
﹣
=
×
=
计算：
4.8﹣3.09 3.6×
198+397 1.25×0.8
6.7+3 1÷1
3.5×
÷
×．