Hàm số y=f(x) đc cho bởi công thức: y=5/x-1 a) tìm các giá trị của x sao cho vế phải của công thức có nghĩa b) tính f(-2); f(0); f(2); f(1/3) c) tìm các giá trị của x để y= -1; y= 1; y= 1/5

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