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a) 4(√3)² = 4 * 3 = 12
b) (2√2)² = 4 * 2 = 8
c) √7 * 3√7 = 3 * 7 = 21
d) 2√3 * 5√3 = 10 * 3 = 30
e) (2√5/5)² = 4 * 5/25 = 20/25 = 4/5
f) (2/3√6)² = 4 * 6/9 = 24/9 = 8/3 = 2 2/3
g) (- 0,1√10)² = 0,01 * 10 = 0,1
h) - 3√15 * 2√15 = - 6 * 15 = - 90