1.3/5除以2=3/10吨2.3x1/3除以2/5=5/2=2.53.1/2除以1/4=2 2x1/5=2/54.5/6的倒数洞明是6/5 (6/5+4/纳竖告5)除以1/2=45.(1/4+1/5)/(纤早1/4-1/5)=9/20除以1/20=9因此1.3/10吨 2.2.53.2/54.45.9
1.3/102.5/23.2/54.45.9