Jika A === , maka A-1 === ....
A-1 === 12\frac{1}{2}21
A-1 === 16\frac{1}{6}61
A-1 === 15\frac{1}{5}51
A-1 === 13\frac{1}{3}31
A-1 === 19\frac{1}{9}91