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一函数从负值连续变化到正值(或者反之),中间至少要取一次零值,这就是连续函数的零点定理,函数值为零时所对应的自变量称为该函数的零点.
A continuous change from a negative value to a positive value (or vice versa), the middle to take at least a zero value, which is the continuous function of the zero point theorem, zero value corresponding to the argument is called the zero point of the function.