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x CuSO4 - 100g roztworu
x=30x100/130
x=23,1 %
odp:23,1%-cp
30g subst.-----130g roztworu(30g+100g)
xg subst.------100g roztworu
x=30*100/130
x=23,1g
x=23,1%
x CuSO4 - 100g
mnożenie na krzyż
x=30*100:130
x=23,1 %