Heron's method/7/Start member 3/3 Steps/Exercise

Do the first three steps in Heron's method to compute the square root of ${}b=7$ with initial value ${}x_{0}=3$ (so the approximations ${}x_{1},x_{2},x_{3}$ for ${}{\sqrt {7}}$ shall be computed; these numbers have to be given as fractions reduced to lowest terms).

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