- $${\text{c}}\left( {{\text{m}} - {\text{M}}} \right){\text{g}}$$
- $${\text{c}}\left( {{\text{m}} + {\text{M}}} \right){\text{g}}$$
- $$\frac{{\text{c}}}{{\left( {{\text{m}} + {\text{M}}} \right){\text{g}}}}$$
- $$\frac{{\text{c}}}{{\left( {{\text{m}} - {\text{M}}} \right){\text{g}}}}$$
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