长方体的长宽高之和=96/4=24cm长方体的长=24*5/(5+4+3)=120/12=10cm长方体的宽=24*4/(5+4+3)=96/12=8cm长方体的高=24*3/(5+4+3)=72/12=6cms表=(10*8+10*6+8*6)*2=188*2=376cm^2v=abh=10*8*6=480cm^3答: