An difríocht idir athruithe ar: "Monaplacht"
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Líne 26:
'''Sampla'''
Le feidhm mheánioncaim líneach <math>p(X) = a – bX</math> agus costais imeallaigh seasmhacha <math>c'(X) = c</math>
*
*<math> \pi(X) =
*<math> \pi(X) =
*<math> \pi'(X) =
*<math>X = \frac{a - c}{2b}</math>
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