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A = {1, 2, 3, 1/2} /. ({Rational[x_, y_] :> If[x > 0, HoldForm[x/y]), -HoldForm@Evaluate[-x/y]]}; B = MapAt[HoldForm, {1, Sqrt[2], Sqrt[3], Sqrt[6]}, 2 ;;] A.B
1+2 Sqrt[2]+3 Sqrt[3]+1/2 Sqrt[6]
A = {1, 2, 3, 1/2} /. (Rational[x_, y_] :> HoldForm[x/y]); B = MapAt[HoldForm, {1, Sqrt[2], Sqrt[3], Sqrt[6]}, 2 ;;] A.B
A = {1, 2, 3, 1/2} /. {Rational[x_, y_] :> If[x > 0, HoldForm[x/y], -HoldForm@Evaluate[-x/y]]}; B = MapAt[HoldForm, {1, Sqrt[2], Sqrt[3], Sqrt[6]}, 2 ;;] A.B
A = {1, 2, 3, 1/2} /. (Rational[x_, y_] :> HoldForm[x/y]); B = HoldForm /@MapAt[HoldForm, {1, Sqrt[2], Sqrt[3], Sqrt[6]}, 2 ;;] A.B
A = {1, 2, 3, 1/2} /. (Rational[x_, y_] :> HoldForm[x/y]); B = HoldForm /@ {1, Sqrt[2], Sqrt[3], Sqrt[6]} A.B
