如果变量x,y有关系y=kx(k≠0),那么称变量x,y成正比例,函数y=kx叫做正比例函数,常数k叫做比例系数,比如在路程不变的条件下,速度和时间成正比例.
什么叫正比例?^0^快,快,快1!^0^GO,GO,GO!^-^举例啊
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