X- доля 203 Tl => 1-x доля 205 Tl
203x + 205(1-x) = 204,38 => 0,62 = 2x => x = 0,31
31% 203Tl
69% 205 Tl
X- доля 203 Tl => 1-x доля 205 Tl
203x + 205(1-x) = 204,38 => 0,62 = 2x => x = 0,31
31% 203Tl
69% 205 Tl