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二次函数是初中数学的重点、难点,也是中考的热点.学好二次函数,需要把握好如下几点.一、理解二次函数的定义一般地,形如y=ax2+bx+c(a,b,c是常数,≠0)的函数叫做二次函数.例如y=-12+3x2,y=2x2,s=1+t+5t2都是二次函数.在理解二次函数的概念时,要注意以下几点:(1)任何一个二次函数的表达式都可以化为y=ax2+bx+c(a,b,c是常数,a≠0)的形式,它叫做二次
Quadratic function is the focus of junior high school mathematics, the difficulty is also a hot spot in the exam. Learning good quadratic function, need to grasp the following points: First, to understand the definition of quadratic function Generally, the form of y = ax2 + bx + c , b, c are constants, ≠ 0) is called quadratic function, for example, y = -12 + 3x2, y = 2x2, s = 1 + t + 5t2 are quadratic functions. In understanding the concept of quadratic function , We should pay attention to the following points: (1) The expression of any quadratic function can be expressed as y = ax2 + bx + c (a, b, c are constants, a ≠ 0)