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y-dł.
2x+2y=40 /;2
x+4=y-5
x+y=20
x-y=-5-4
2x=11
x=5,5
5,5+y=20
y=14,5
P=x*y
P=14,5*5,5=79,75
spr.
Obw.=2x+2y=2*5,5+2,14,5=11+29=40