Question

一道求斜率的数学题,应该不难求函数y=3(x-1)/(x+2)(x大于等于0)的值域答案是[-1/2,3]我初学,答案是

Answer 1

由题,y=3(x-1)/(x+2)=3-[9/(x+2)]

x≥0时,x+2≥2

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