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obwód:24cm
a=2x
b=1x
Rozwiązanie:
2x+1x+2x+1x=6x
24cm:6x=4cm
x=4cm
a=2*4cm=8cm
b=1*4cm=4cm
1 bok- x = 4
2 bok - 2x = 8
2 * x + 2x * 2= 24
2x + 4x= 24
6x = 24/6
x = 4