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用数值例子解释为什么中心差 (f(a+h)-f(a-h))/(2h) 在数值上比前向差 (f(a+h)-f(a))/(h) 更精确。
用数值例子解释为什么中心差 (f(a+h)-f(a-h))/(2h) 在数值上比前向差 (f(a+h)-f(a))/(h) 更精确。
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