问:(1)已知实数x,y满足不等式x^2-2x≥y^2-2y,若1≤x≤4,求y/x的取值范围;
问题描述:
问:(1)已知实数x,y满足不等式x^2-2x≥y^2-2y,若1≤x≤4,求y/x的取值范围;
(2)已知函数f(a)=(3m-1)a+3b-2m,当m∈【0,1】时,0≤f(a)≤1恒成立,求(9a^2+b^2)/ab的取值范围.
答
由题意得x^2-2x+1>y^2-2y+1
即有(x-1)^2>(y-1)^2
|x-1|>|y-1|
即有x-1>y-1或x-1y或x+y