论文部分内容阅读
求一条直线(线段)或射线的解析式,一般需要知道其图象上两点坐标,之后将其代入“y=kx+b”中,便能够求出其解析式,或者是代入两组x,y值可求出.但若能理解“k”的实际意义,根据已知条件也可以直接确定k值,这样求其解析式就再只须一点坐标即可,从而能够较为容易地解决有关比较复杂的一次函数的实际应用问题.在实际问题中,“k”的值往往就是单位时间内事物发展运动变化的量.如涉及速度问题,“k”的绝对值往往就等于速度值.“k”的符号根据题意便可以确定.例1某校部分住校生,放学后到学校锅炉房打
Find a straight line (line) or ray analytical formula, the general need to know the coordinates of the two points on their images, and then into the “y = kx + b ”, we can find its analytical expression, or substituted into two However, if we can understand the actual meaning of “k ”, we can directly determine the value of k according to the known conditions, so that the analytic formula can only be a little more coordinate, which can be more In practical problems, the value of “k ” is often the amount of change in the development of things in a unit of time, such as speed, “k ” absolute The value is often equal to the speed value. “K ” The symbol can be determined according to the inscription.Example 1 some school resident students, after school to the school boiler room to play