√m2n2 x 6√m2n2 x 3√m2n2

m2n2 × 6m2n2 × 3m2n2=18 × m2n2×m2n2×m2n2=18m2n2 × mn=18m3n3

√m²n²x 6√m²n²x 3√m²n²

\sqrt{m^{2} n^{2}} \times 6 \sqrt{m^{2} n^{2}} \times 3 \sqrt{m^{2} n^{2}} = 18 \times \sqrt{m^{2} n^{2}} \times \sqrt{m^{2} n^{2}} \times \sqrt{m^{2} n^{2}} = 18 m^{2} n^{2} \times mn = 18 m^{3} n^{3}