1.720/(1+8)=80 80*1=80(克) 80*8=640(克)
2.5600*(1-4/5)=5600*1/5=1120(吨)
3.80.5/(1-2/5-1/4)=80.5/( 7/20)=80.5*20/7=230(吨)
4.25/(5/9)=25*9/5=45(人)
5.(4/7)/2*3=2/7*3=6/7
6.(20+2)/(1/3)=22/(1/3)=22*3=66(米)
1.720/(1+8)=80 80*1=80(克) 80*8=640(克)
2.5600*(1-4/5)=5600*1/5=1120(吨)
3.80.5/(1-2/5-1/4)=80.5/( 7/20)=80.5*20/7=230(吨)
4.25/(5/9)=25*9/5=45(人)
5.(4/7)/2*3=2/7*3=6/7
6.(20+2)/(1/3)=22/(1/3)=22*3=66(米)