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x+3 - II bok
Obw=26
2x+2(x+3)=26
2x+2x+6=26
4x=26-6
4x=20 / :4
x = 5
x+3=5+3=8
P=5*8=40 cm²
x+3 -dr. bok
26=2x+2(x+3)
26=4x+6
20=4x
x=5
jeden bok -5
dr. bok - 5+3=8
P=a*b
P=5*8
P=40 cm <kwadratowych>
prosze ! :)