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若函数f(x)满足\(f\left ( {a+b} \right )=\frac {f\left ( {a} \right )+f\left ( {b} \right )} {1-f\left ( {a} \right )f\left ( {b} \right )}\)，且\(f\left ( {2} \right )=\frac {1} {2}\)，\(f\left ( {3} \right )=\frac {1} {3}\)，则\(f(7)=\)___．
参考答案：3
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