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求函数的零点个数,常用方法有三种,第一种是将函数f(x)转化方程f(x)=0求零点个数;第二种是依据零点存在性定理,根据函数的性质(如单调性、奇偶性)确定函数的零点个数;第三种是画出函数的图象,看其与x轴的交点个数确定函数零点的个数.一、直接解方程求零点个数
There are three commonly used methods to find the zero point number of the function. The first one is to find the zero point by transforming the function f (x) = 0 into 0. The second one is based on the existence theorem of zero point and according to the property of the function Such as monotonicity, parity) to determine the number of zero points of the function; the third is to draw the image of the function to see the number of its intersection with the x-axis to determine the number of zero points.