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考点一:确定常量和变量的取值范围这一考点主要是考查函数的x和y的取值范围以及y随x的变化而变化的性质.对于形如y=kx+b的一次函数,应明确k≠0的意义、b
Test site one: determine the constants and variables range This test is mainly to test the function of the range of values of x and y and y with the x changes in the nature of the shape, such as y = kx + b of the primary function should be Clear the meaning of k ≠ 0, b