初中代数中的函数是研究两个变量之间的运动变化、相互联系、相互制约的内在关系的,学习函数时,要把握好以下几方面的问题.一、弄清白变量允许值的范围每个函数的自变量都有其确定的取值范围.1.解决某些实际问题时,如果题目给出自变量的取值范围,解题时,只 The function in junior high school algebra is to study the internal relations between movement, mutual connection, and mutual restraint between two variables. When learning the function, we must grasp the following aspects. First, find out the range of permissible value of the white variable. Each function’s independent variables has its defined range of values. 1. When solving certain practical problems, if the title gives the range of values ​​of the independent variables, when solving problems, only