In theory of approximations , the classic methods of polynomial approximation for rational expression are various interpolations and operator approximations , such as lagrange interpolation , hermite interpolation and bernstein polynomial approximation 在逼近论中，用多项式逼近有理式的经典的方法是各种插值与算子逼近方法，如lagrange插值、 hermite插值和bernstein多项式逼近等。
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