y=2+9/(x-5) (x>=7)y= -2+5/(x-2) (x>=3)
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y=2+9/(x-5)(x>=7)y=-2+5/(x-2)(x>=3)y=2+9/(x-5)(x>=7)y=-2+5/(x-2)(x>=3)y=2+9/(x-5)(x>=7)y=-2+5/(x-2)(
y=2+9/(x-5) (x>=7)y= -2+5/(x-2) (x>=3)
y=2+9/(x-5) (x>=7)
y= -2+5/(x-2) (x>=3)
y=2+9/(x-5) (x>=7)y= -2+5/(x-2) (x>=3)
y=2+9/(x-5) (x>=7)
此题主要是x-5不能等于0,而题意x>=7,则说明Y的最大值为:y=2+9/(7-5)=2+4.5=6.5,所以y的值域为 >=6.5,下题同理,>=3.
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