按常规题上单位是毫米
故有0.19*0.19*0.39=(0.2-0.01)^2*(0.4-0.01)
=(0.04-0.004+0.0001)*(0.4-0.01)
=0.0361*(0.4-0.01)
=0.01444-0.000361
=0.014079(m^3)
而1m^3=1/0.014079( 个0.19*0.19*0.39)
约等于71个0.19*0.19*0.39
按常规题上单位是毫米
故有0.19*0.19*0.39=(0.2-0.01)^2*(0.4-0.01)
=(0.04-0.004+0.0001)*(0.4-0.01)
=0.0361*(0.4-0.01)
=0.01444-0.000361
=0.014079(m^3)
而1m^3=1/0.014079( 个0.19*0.19*0.39)
约等于71个0.19*0.19*0.39