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【多选题】
关于牛顿迭代以及牛顿迭代法的改进,下面说法正确的是A.
牛顿迭代法的收敛速度快，但是对初值的选取要求苛刻。
B.
牛顿迭代法，在迭代时求导数值以防止迭代发散。
C.
牛顿下山法是牛顿迭代法的改进方法。
D.
牛顿下山法的下山因子选取可随机选取。
E.
牛顿下山法若找不到合适的下山因子，则有可能“下山失败”。
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