y=3x+1/5x-7值域
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y=3x+1/5x-7值域
![y=3x+1/5x-7值域](/uploads/image/z/19865086-70-6.jpg?t=y%3D3x%2B1%2F5x-7%E5%80%BC%E5%9F%9F)
y=3x+1/5x-7=1/5*(15x-21+21+5)/(5x-7)
=3/5+26/5(5x-7)
5x-7≠0
则y≠3/5
=3/5+26/5(5x-7)
5x-7≠0
则y≠3/5
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