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y-szerokosc
głębokość=1,8m
objętość=2250m³
x=2y
x×y×1,8=2250
x=2y
2y×y×1,8=2250
x=2y
2y²×1,8=2250 /÷1,8
x=2y
2y²=1250 /÷2
x=2y
y²=625
x=2y
y=25
x=2y=2×25=50m
y=25m
odp: dlugosc basenu to 50m szerokosc 25m