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½r=8*1¾
½r=14
r=28
1/2r : 7/4 = 8
1/2r * 4/7 = 8
r * 2/7 = 8 / * 7
2r = 56 / : 2
r = 28
½r=8*1¾
½r=14
r=28
myślę że dobrze i pozdrawiam:)