Вправи 801- 887 » 818

818. Обчисли. а) (3√32 + √162 – 2√288) • √2 + 15 = 3 • √64 + √324 – 2√576 + 15 = 24 + 18 – 48 + 15 = 9; б) (4√150 – 6√54 + 2√96)2 – 20 = (4 • 5√6 – 6 • 3√6 + 2 • 4√6)2 – 20 = (20√6 – 18√6 + 8√6)2 – 20 = (10√6)2 – 20 = 600 – 20 = 580. в) (√45 – √20) : √5 = (3√5- 2√5)/√5 = √5/√5 = 1; г) (7√108- √12)/(2√75) = (42√3- 2√3)/(10√3) = (40√3)/(10√3) = 4.