1、由题知零售量为x,批发量为3x,储藏量为200-4x∴y=3500x+2300·3x+4300(200-4x)=860000-6800x2、即200-4x≤80,解得x≥30∴y≤ymax=860000-6800×30=656000
1+1=2 3+6=9 7+8=15