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P= 5,5 * 2
P= 11
x-dłuższy bok-- 5,5
x-3,5= krótszy bok---2
15=2x+2(x-3,5)
15=2x+2x-7 /+7
15+7=4x
4x=22 /:4
x=5,5
P=a*b
P=5,5*2
P=11
liczę na naj :D