1) √10 * √160 = √1600 = 40
2) √1/5 * √1/5 = √1/25 = 1/5
3) √3 * √11 * √33 = √1089 = 33
4) √7 * √21 * √3 = √21 * √21 = 21
5) (3√12 + 2√3)² = (3√12)^2 + 2 * 3√12 * 2√3 + (2√3)² = 108 + √4*108*12 + 12 = 108 + 72 + 12 = 192
6) (2√2 - 3√32)² = (2√2)² - 2 * 2√2 * 3√32 + (3√32)² = 8 - √4*8*288 + 288 = 8 - 96 + 288 = 200