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4.5+x - dłuższy bok
x + x+4.5+ x +x + 4.5 = 22
4x + 9 = 22
4x = 22 - 9
4x = 13 / :4
x = 3.25
3.25 + 4.5 = 7.75
Boki tego prostokąta to 7.75 ; 3.25 ; 7.75 ; 3.25 .