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x-zawartość izotopu 10B
1-x - zawartość izotopu 11B
10x + (1-x)*11=10,81
10x + 11 - 11x=10,81
-1x=10,81 - 11
x=0,19
Zawartość izotopu 10B wynosi 19% a 11B 81% (bo 100% - 19%)