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x-jeden bok
x+5-drugi bok
2(x+5)+2x= 38
2x+10+2x=38
4x=28
x=7
x+5=12
Pole= 12*7= 84
II bok - x
2(x+5+x) = 38 |:2
2x+5 = 19
2x = 19-5
2x = 14 |:2
x = 7
I bok - 7+5 = 12
II bok - 7
P = 12cm*7cm
P = 84cm²
38=2x+2x+10/-10
28=4x/:4
7=x
x to krotszy bok
x+5= 12 to dluzszy