Meanwhile, the differences between the conditional extremum and unconditional extremum in concept and evaluation are pointed.

同时还指出了条件极值和无条件极值在概念上及求法上的一些区别。

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Along Yangtze river and Yellow sea side it doesn't refuse normal school, logarithm normal school, and extremum I distributing, but coincides with extremum I distributing best.

水闸沿江、沿海侧潮位的变化规律不拒绝正态分布、对数正态分布和极值I型分布，但极值I型分布最优。

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Via the discussion about the extremum question of two kinds of special ternary function, Obtain the sufficient condition of judging if they can get the extremum by their coefficients.

通过对两类特殊三元函数极值问题的探讨，得到了由其系数来判别它们能否取得极值的充分条件。

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