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x-a/rb
x=a/sb
b) X = br/a
c)X = a/bs
/ - kreska ułamkowa
P=abx]/ab
P/ab=x
b)R=ax/b
R=ax/b]*b
Rb=ax]/a
Rb/a=x
c)S=a/bx
S=a/bx]*b
Sb=a/x]*x
Sbx=a]/bx
x=a/bx
]=/
nie chcialam mylic znakow