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Function: Hàm số

/ˈfəNG(k)SH(ə)n/

Tiếng Việt: Hàm số

English: A function is a special relationship where each input has a single output.
              It is often written as “f(x)” where x is the input value.

Ví dụ: f(x) = 2x, vậy
f(1) = 2
f(2) = 4
f(3) = 6 …

Example: f(x) = 2x (“f of x equals x divided by 2”). It is a function because each input “x” has a single output “x/2”:
                f(1) = 2
                f(2) = 4
                f(3) = 6 …

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