Вычислить: 1) \(\sqrt{(-18)^2}\); 2) \(-5\sqrt{(-0,2)^6}\); 3) \(-75\sqrt{(1\frac{2}{5})^4}\).

1. \(\sqrt{(-18)^2}=|-18|=18\).

2. \(-5\sqrt{(-0,2)^6}=-5\cdot|(-0,2)^3|=-5\cdot0,008=-0,04\).

3. \(-75\sqrt{(1\frac{2}{5})^4}=-75\cdot(1\frac{2}{5})^2=-75\cdot1,96=-147\).

Ответ: 1) 18; 2) −0,04; 3) −147.