已知(m分之n)的负1次方=3分之5,

(n/m)^(-1)=m/n=5/3
所以n=0.6m
原式=m/(m+0.6m)+m/(m-0.6m)-0.36m²/(m²-0.36n²)
=1/1.6+1/0.4-0.36/0.64
=41/16