如图，在一块长30厘米，宽20厘米的长方形纸板的四角各剪去一个边长为2厘米的小正方形，然后折成一个无盖的长方体盒子．
（1）求此长方体盒子的底面积．
（2）求此长方体盒子的侧面积．
直接写出得数
18×40= 910÷70= 6.3÷0.1= 36×25%= 100×10=
35×0.1= 75﹣75×0.1=
=
=
=
直接写出得数．
28+46= 5.7+2.35=
=
=
= 50×40=
1﹣0.9=
=
口算：
200﹣102= 0.29÷10= 0.33= 0.32﹣0.2=
7.9÷100%= 2.52=
×
= 36÷
=
450﹣140= 25÷7= 900+238= 600﹣9×8=
90﹣7×5= 26+30﹣28= 48÷（2+4）= 780﹣772=
26+24= 80﹣30= 78﹣26=
=
= 0.25×2.69×4= 10﹣2.87﹣7.13=
÷24=
3÷
= 0.87﹣0.49 4.9×0.7=
=
=
=
=
=
（25+4）×4= 12.37﹣3.25﹣6.75= 3/14×6= 0.51÷17=
14﹣7.4= 5.2÷1.3= 25×12=
=
= 2.5﹣2= 36﹣29= 120÷4=
300+25= 630﹣30= 4×50= 15.9+10.8=
26×13= 24÷4+56÷4= 8﹣2.5= 12×2.5=
2吨50千克= 吨．
直接写得数．
204+583= 11﹣
= 3×
= 0.64÷0.08=
﹣
=÷
= 2.6×0.25×4= 62=
0.56×
=÷50%= 11.75﹣1.05=
÷
=