课后练习64080= 155=233=1225= 48080= 165= 273= 9015= 484= 64016= 393= 2420= 323= 4816= 128= 273= 5614=248= 142= 8345= 56080= 9624= 4020= 4030= 3726= 7639= 60559= 3023= 128= 2732= 4827= 450020=7315 = 120600 = 200360= 6800400= 280270=42500= 600040= 51280=4.32.70.750.25 40.260.352.74.61.9 0.830.3 30.05 7.23.8 0.070.6 1.390.39 105.4 25.623