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y=3x+1/5x-7值域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
y=3x+1/5x-7值域
y=3x+1/5x-7值域
y=3x+1/5x-7值域
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