A1=63
A2=65
X1%=X
X2%=(100-X)
Korzystam ze wzoru na średnia masę atomową
m at. = A1*X1% + A2*X2%/100%
63,55 = 63*X + 65(100-X)/100
6355 = 63*X + 6500 - 65*X
2*X = 145
X = 72,5
X1=72,5% Cu-63
X2=100-72,5
X2=27,5% Cu-65
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A1=63
A2=65
X1%=X
X2%=(100-X)
Korzystam ze wzoru na średnia masę atomową
m at. = A1*X1% + A2*X2%/100%
63,55 = 63*X + 65(100-X)/100
6355 = 63*X + 6500 - 65*X
2*X = 145
X = 72,5
X1=72,5% Cu-63
X2=100-72,5
X2=27,5% Cu-65