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y-dł dłuższego boku prostokąta
x/y=3/4 --->3y=4x
x+1=y-1 ---> x=y-2
3y=4(y-2)
3y=4y-8
y=8 cm
x=8-2
x=6 cm
P=xy
P=6*8
P=48 cm²