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| 217번째 줄: | 217번째 줄: | ||
<math> \frac{1}{M} ( \rho ( b/2 + x/2 ) \frac{1}{2} ( b/2 + x/2 ) + \rho (b/2 - x/2 ) \frac{1}{2} ( b/2 + 3x/2 ) ) </math> | <math> \frac{1}{M} ( \rho ( b/2 + x/2 ) \frac{1}{2} ( b/2 + x/2 ) + \rho (b/2 - x/2 ) \frac{1}{2} ( b/2 + 3x/2 ) ) </math> | ||
이고, | |||
이는 <math> \frac{1}{8M} ( M/b ( b+ x)^2 + (b-x )(b+ 3x ) ) </math> | |||