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2liczba - 5/4x
3 liczba- x
x+5/4x+4/5×5/4x=91
2x+5/4x=91
3 1/4 x=91
x= 91÷3 1/4
x=28 - 3 liczba
5/4*28= 35 - 2 liczba
4/5*35= 28 3 liczba