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a-dluzszy bok
b-krotszy bok
2a+2b=2000cm
a=3b
2×3b+2b=2000cm
a=3b
6b+2b=2000cm
a=3b
8b=2000cm
a=3b
b=250cm
a=3b=3×250=750cm
Pole=a×b=750×250=187500cm²
odp: pole prostokąta wynosi 187500cm²