1) HCK (14; 35) = 70; 2) HCK (10; 30) = 30; 3) HCK (8; 21) = 168; 4) HCK (36; 54) = 108; 5) HCK (630; 560) = 5040; 6) HCK (12; 16; 18) = 32 · 42 = 144;