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x - pierwszy bok prostokata
32cm - obwod prostakata
2*4x=32
8*=32/:8
x=4
3x=12
P=4*12=48 cm2
*-Oznacza znak mnozenia
3*a-drugi bok prostokątna - 12cm
obwód prostokąta - 32cm
3*a+3*a+a+a=32
8a=32
a=32/8
a=4cm
P=4*12=48