3/5+1/5=4/5吨3/5*(1+1/5)=18/25吨3/5除以4/5=3/4
乙重4/5吨
乙重 （3/5）* (1 + 1/5) = 18/25吨
甲是乙的 (3/5) / (4/5) = 3/4
3/5+1/5=4/53/5(1+1/5)=3/5×6/5=18/253/5÷4/5=3/5×5/4=3/4
4/53/5*(1+1/5) = 18/253/4
1.4/52.18/253.3/4
