1(1)2CM=2平方厘米 V=sh
V=sh =0.8×5.5
=20×2 =4.4
=40
2(1)0.9×0.9=0.81
(2)0.81×8=6.48
设水深X米
24×5×x=360
120x=360
x=3
4A:60-3-3=54
B:40-3×2=34
C:50-3=47
V:54×34×47=86292
5 0.7-0.2=0.5
1.2×0.8×0.5=0.48
思考题 A:40-5×2=30
B:30-5×2=20
V:30×20×5=3000