i 2 3 Xi 0.5 1 1.5 f(x;) -1 -0.625 1.5 7.625 P(x)= ? P(x) = L, (x)fo +L (x)f¡ + L,(x)f, + L;(x)f; +.... (x- x, )(x – x1)...(x – x,-1)(x – x;41)....(x – x,) L, (x; - x,)(x; - x,) .(x; - x;-1 )(x; - x41) .(x, – x, )

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