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y=2 bok
y=80%x
2x+2y=108m
2x+2×0,8x=108
2x+1,6x=108
3,6x=108
x=108:3,6
x=30m
0,8×30m=24m
plac ma wymiary:24m na 30m
pole=30×24=720m²
1ar=100m²
1m²=0,01ara
720m²=720×0,01=7,2ara ma ten plac