a)[8-3×(-7/13)⁰]^-2=(8-3×1)^-2=(8-3)^-2=5^-2=1/5²=1/25
[tex]b)4 \sqrt{18} - 2 \sqrt{8} - \sqrt{3} (3 \sqrt{12} - 1) = 12 \sqrt{2} - 4 \sqrt{2} - \sqrt{3} \times (6\sqrt{3} - 1) = 12 \sqrt{2} - 4 \sqrt{2} - 1 8 + \sqrt{3} = 8 \sqrt{2} - 18 + \sqrt{3} [/tex]
