tolong bantu jwb menggunakan cara ,jika jwbannya sulit di ketik ,tulis saja di kertas lalu kirim fotonya ,terima kasih

[tex](\frac{3a^{-2}b^{3}c^{4}}{15a^{3}b^{-5}c^{-2}})^{3} \\ = (\frac{1}{5}a^{-5}b^{8}c^{6})^{3} \\ = (\frac{b^{8}c^{6}}{5a^{5}})^{3} \\ = (\frac{b^{24}c^{18}}{125a^{15}})[/tex]

[tex]\frac{\sqrt{2}+\sqrt{5}}{4\sqrt{3}-7} = \frac{\sqrt{2}+\sqrt{5}}{4\sqrt{3}-7} \times \frac{4\sqrt{3}+7}{4\sqrt{3}+7} \\ \frac{\sqrt{2}+\sqrt{5}}{4\sqrt{3}-7} = \frac{4\sqrt{6}+7\sqrt{2}+4\sqrt{15}+7\sqrt{5}}{48-49} \\ \frac{\sqrt{2}+\sqrt{5}}{4\sqrt{3}-7} = -(4\sqrt{6}+7\sqrt{2}+4\sqrt{15}+7\sqrt{5})[/tex]