苹果:9/10×3/8=27/80=0.3375(吨)梨子:9/10×1/5=9/50=0.18(吨)香蕉:9/10×1/4=9/40=0.225(吨)橘子:9/10-(0.3375+0.18+0.225)=0.9-0.7425=0.1575(吨)