G=MgR2\mathrm{G}=\frac{\mathrm{M}}{\mathrm{gR}^{2}}G=gR2M
G=gMR2G=gMR^2G=gMR2
G=gR2MG=\frac{g R^{2}}{M}G=MgR2
G=gMR2G=\frac{g M}{R^{2}}G=R2gM