An difríocht idir athruithe ar: "Monaplacht"

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Líne 27:
 
Le feidhm mheánioncaim líneach:
<math>p(X) = a - bX</math>
agus costais imeallaigh seasmhacha <math>c'(X) = c</math>.
* <math>\pi(X) = p(X)*X - c(X)</math>