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a+b=120m a=120-b
P=½ab
P=½b(120-b)
1000=½b(120-b)
2000=120b-b²
b²-120b+2000=0
Δ=(-120)²-4*1*2000=14400-8000=6400
√Δ=80
b₁=(120-80):2=20
b₂=(120+80):2=100
krótsza pryprostokatna ma 20m