2mn−1m2\frac{2 m n-1}{m^{2}}m22mn−1
1−2mnm2\frac{1-2 m n}{m^{2}}m21−2mn
2n−1m2\frac{2 n-1}{m^{2}}m22n−1
1−2nm2\frac{1-2 n}{m^{2}}m21−2n